Going underground is all the rage these days, with a tricked-out basement an absolute must for any high net worth homeowner.

From basement swimming pools and supercar galleries to a beauty salon, high-end gym and even a jazz bar, click or scroll on to feast your eyes on some of the world's most opulent basements.

Few homes in the English capital of London are as big or as bling as this one. Described by United Kingdom Sotheby's International Realty as "a once-in-a-generation trophy home", this impressive property lies in the neighbourhood of Knightsbridge, in a handsome redbrick mansion block.

Amazingly, it benefits from over 11,000 square feet (1,022sqm) of living space and is arranged over four floors. 

The so-called quadruplex was masterminded by renowned developer Finchatton and finished by leading superyacht design studio, RWD. So, as you can imagine, the interior spaces are finished to perfection, with parquet flooring, elegant wainscoting and stone fireplaces.

As well as all the usual reception rooms and bedrooms, you’ll also find an amazing basement level that was designed for fun and entertaining. It comes with an elegant cinema, a games room and a wine cellar. 

There’s also an amazing gym, kitted out with everything you could need for the perfect workout. It's no surprise that this beautiful property comes with an eye-watering price tag.

Listed with United Kingdom Sotheby's International Realty in April 2025, the home was valued at £40 million ($53.4m).

Truly a home fit for a billionaire, The Manor, in the affluent Holmby Hills neighbourhood of Los Angeles, once belonged to Petra Ecclestone, the daughter of Formula One founder, Bernie Ecclestone. According to Mansion Global, Petra purchased the property in 2011 for £63.4 million ($85m).

The lavish home was constructed in 1991 for TV producer Aaron Spelling – the man behind Dynasty and Beverly Hills 90210. Yet Petra Ecclestone is said to have spent a lot of time and money renovating the place, and it shows... 

The 56,500-square-foot (5,249sqm) mansion comes equipped with endless living rooms, 14 bedrooms and 27 bathrooms. Every single room is decked out with the finest finishes and materials, including marble and limestone.

Yet the home's most exciting feature has to be its basement. There's a billiard room, a games room, a wine cellar, a gym, a nightclub and a two-lane bowling alley, with its own shoe closet.

Although we're not entirely sure these amenities are located in the basement, the home has a room dedicated to cutting flowers, a humidity-controlled room for storing silver, a French wine and cheese room and multiple gift-wrapping rooms. There’s even a beauty salon, complete with a hairdresser's station, nail bar, massage rooms and a pedicure zone. 

It's no wonder Petra originally listed the 123-room home for £149 million ($200m), in 2019. It was back on the market in February 2022, with Carolwood Estates, for £123 million ($165m), before the price was lowered to £103 million ($138m) in April 2024. 

The city of Dubai in the United Arab Emirates is known for its glitzy coastline, year-round sunshine and extravagant mansions. This amazing home is just one example of how luxurious the real estate options are in this modern metropolis.

The property sits on its very own private stretch of sand, on the iconic Palm Jumeirah.

Spread over 16,833 square feet (1,563sqm), the three-storey mansion has clearly been built with no concerns about costs – every single room is immaculately finished, with the very finest materials and details. In fact, almost every room features large-scale marble installations.

While the main living rooms enjoy beach views, the basement is a tranquil oasis where the lucky occupants can unwind in style.

The subterranean level comes kitted out with an industrial chef’s kitchen for catering to a large number of people, a spacious bar and entertainment space and a private cinema. There's even a contemporary bowling alley.

This might be why the stunning home was listed for sale in April 2025, with Dubai Sotheby's International Realty, for £38.6 million ($51.7m).

American makeup artist and influencer, Jeffree Star, is thought to be worth £149 million ($200m), thanks to his loyal social media followers and highly successful cosmetics line. So, he has plenty of cash for splashing on luxury homes.

This ridiculously opulent property belonged to the star, until he decided to sell the place in 2021. He offloaded it for a cool £12.5 million ($16.7m), after relocating to Wyoming.

Situated on 2.8 acres (1.1ha), the 19,000-square-foot (1,765sqm) French Normandy-style mansion is located inside a gated community in Hidden Hills. The main home has eight bedrooms and 13 bedrooms, but there are also two guest houses and, of course, a seriously envy-inducing basement.

The underground space comes complete with a home theatre with red velvet seats, a contemporary wine cellar, a speakeasy bar, a full spa and salon, a games room and a state-of-the-art, two-storey gym.

The property also boasts a huge basement garage, where Star housed his amazing collection of pink super cars, including a rare Barbie-hued Ferrari.

The space is capable of accommodating more than 10 cars at once and comes with luxe lighting and secure steel doors, for ultimate security and safety.

The American state of Florida is home to some seriously jaw-dropping homes, with mansions offering everything a super-wealthy VIP could want or desire.

This property in Reunion is case in point. Measuring 25,000 square feet (2,323sqm), it offers 14 bedrooms, so can accommodate up to 30 people, as well as a lazy river, a rooftop pool and a conference room for business needs. But that isn't all...

The ultimate entertainer's paradise, the property comes complete with a basement recreation room that's jam-packed with exciting features.

There's a golf simulator, a bowling alley with two lanes and an amazing lounge space and a games room with arcade machines.

Oh, and there’s even a huge basketball court that looks to have been plucked from a private leisure facility!

We're not done, either. There's also a two-tier home cinema with a 150-inch (381cm) screen, a fully-equipped gym and a spa with a sunken hot tub, sauna and steam room.

London is famed for its lavish 'iceberg' basements but mega-wealthy property owners outside the capital are just as eager to dig down, judging by this amenity-loaded mansion in Surrey, UK. The mansion has all the trappings the super-rich demand, including a marble-floored leisure reception area, a top-of-the-range gym and an elegant tasting room. 

The 70-room country pile was for sale in April 2025, for £29 million ($38.8m), before it had even been built. In fact, these images are all CGI designs, showing prospective buyers exactly what to expect if they splashed out on the place.

Hampton Hall promised house-hunters a range of incredible features, including a basement swimming pool complex. Bathed in light, thanks to its glorious glass ceiling, the pool features grand columns, exquisite mosaic tiling and a wall dotted with twinkling LED lights. The pool will form part of the lower-ground spa, which will also include a sauna, steam room, hot tub and treatment room.

Adjacent to the pool will be this stunning lounge space and games room, with a high-end pool table, premium built-in cabinetry and plenty of finely upholstered seating. 

The wow-factor amenities don't stop there. The lower-ground level will also have a bowling alley, which could be one of the poshest on the planet with a statement chandelier hung above the lanes. Between games, well-heeled bowlers can relax on comfy leather sofas.

Adding immeasurably to the basement's billionaire appeal is the proposed marble-clad supercar gallery, with a revolving turntable built into the floor, not to mention an auto lift and glass wall. The basement will also house a lounge, self-contained staff quarters and an Art Deco-style home cinema, with a sensational fibre-optic star ceiling. 

Luxury cinema seating firm Elite HTS didn't hold back with this sensational Dark Knight-themed space, which the company conceptualised in 2014 for "a reclusive client." The basement can be found inside a mansion in Greenwich, Connecticut, and is reported to have set the owner back £1.5 million ($2m).

To access the unbelievable home cinema, the homeowner enters a secret lift located behind a grandfather clock at the back of a private study. The lift has a fingerprint and retina scanning system, to ensure only the owner can enter the subterranean Batcave.

Measuring 12,000 square feet (1,115sqm), the theatre stuns with six life-sized replica Batsuits, along with a garage housing a copycat Batmobile and an escape tunnel, which is hidden behind a sliding bookcase door.

Other features of the amazing space include an Austrian-made 283-foot (86m) 4K screen and race car-inspired leather seats, each of which have Crowson amplifiers, actuators and transducers built in to offer a 4D movie experience.

Elite HTS has adapted the concept to produce variations on The Batcave home cinema. They include a simpler version, which has a more pared-down, underground cave-like feel. 

Perfect in every detail, this shrine to the Caped Crusader is worthy of any superfan. 

Villa St. Pierre is a true trophy compound. The Bel-Air home has a two-storey living room, eight bedrooms and a pristine pool set in manicured gardens, as well as a separate subterranean entertainment area that's bigger than most mansions.

Tucked away in the garden is a domed entryway, which looks as if it must be a pool house. However, once you're through the wrought-iron doors you descend down an elegant staircase to discover 18,000 square feet (1,672sqm) of fun and relaxation – including an incredible underground pool.

The amazing pool is flanked by columns and is complemented by a sauna and massage rooms, as well as a gym set behind curved glass walls. Opposite the gym, there's even a full indoor racquetball court.

There's an additional lounge, a guest ensuite bedroom and a glamourous 'tasting lounge', complete with a grand piano and a 700-bottle display wall. The home theatre seats more than 30 people on its custom-made furniture. Not only is there a large projection screen, with velvet curtains, but a stage for live performances. 

There's also a vintage-style bowling alley, equipped with old-fashioned TV screens and ball returns. Despite being below ground, it's a bright space adorned with multiple faux blue porthole 'windows' and a stained-glass window-style light at the end of the twin lanes. 

Villa St. Pierre was on the market in February 2024, with Carolwood Estates, for £33.6 million ($44.9m). Take a tour via this YouTube video.

Some homes are just too lavish to be true. Enter Villa Siena! This modern masterpiece extends 35,000 square feet (3,252sqm) and even has an extraordinary 12,000-square-foot (1,115sqm) rooftop deck.

As well as stunning living spaces that flow in and out of the gorgeous garden, the home also boasts a primary suite with a retractable roof that opens for stargazing. And that’s not nearly all!

Head downstairs to the basement and you’ll find one of the most amazing spas we’ve ever seen. Designed to provide a “water journey”, the wellness space has hot and cold plunge pools, and a hydrotherapy chamber for red light therapy.

Inspired by the forest, the spa has lush plantings on the ceiling, stepping stone pathways and LED screens that play videos of tropical scenes, for a truly immersive experience.

There’s also a screening room, a Jazz club, a bar and an auto gallery, with space for six cars. Other amazing extras include the home’s wine room, which is accessed through 200-year-old antique doors. Every space is finished with dreamy materials, like stone, teak and bronze, as well as designer lighting.

This truly mind-blowing mansion was listed for sale with The Beverly Hills Estates in April 2025, priced at £132 million ($177m). We just know it would be worth every single penny.

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