When it comes to designing your dream home, you're never too old to have a little fun. We’ve compiled a collection of amazing houses designed with big kids in mind. From adult-sized slides to swings, climbing walls, secret rooms and tunnels, these houses are the perfect properties for real-life Peter Pans.

Once listed at £192 million ($250m), this Bel Air mansion used to be America’s most expensive home and it’s not hard to see why. The sprawling house is fitted with every luxury you can think of, including an underground garage filled with luxury cars, a working helicopter pad and an 85-foot infinity pool.

With 38,000 square feet of living space, the lavish mansion is packed with every toy a real-life Peter Pan could ask for. Our favourite space has to be the games room, complete with a candy wall and enough foosball tables for an entire team.

Adjoining the games room, you’ll find a four-lane bowling alley. With its stylish decor and plush furnishings, it’s quite possibly the most luxurious alley we’ve ever seen – definitely fit for competitive grown-ups as well as the big kids amongst us.

All that bowling could easily get tiring, but luckily this huge billionaire mansion comes with a comfortable cinema room, perfect for lazy days spent watching movie marathons. With 40 seats, we can imagine it would make the ideal giant sleepover venue too!

This playful home was created by Brazilian architects Pascali Semerdjian Arquitetos. With its bright, open-plan living spaces and colourful, geometric furnishings, it looks like a fantastic place for children to run riot, as well as for big kids to let off some steam.

The home seamlessly blends indoors and outdoors with an expansive wall of floor-to-ceiling sliding doors. We love the bright orange slide peeking out from beneath the steel staircase across the courtyard too. What a way to travel between the home's three levels!

The property's slide isn’t the only fun way to get around. There’s also a bright red rope bridge connecting the house to an observation tower. Dense greenery has been planted beneath to make residents feel as though they're intrepid explorers navigating their way through a jungle.

Upstairs, the house can be expanded, reduced and reconfigured using blinds and shutters that have been built into the metal frame. Small alcoves both indoors and outdoor are highlighted with primary colours, reminiscent of Lego blocks. They're also used to display an array of toys, from models and figurines to plush Muppets and Minions.

You’d never know from the exterior of this Grade A-listed home in Melbourne that beneath it lies a Batcave-inspired car showroom. Architecture and interior design firm Molecule was tasked with adding a garage and a bit of glamour to this rather well-mannered Australian mansion without causing any unbalance to the house and grounds.

Fittingly, the entrance to the garage is just like something out of the pages of a 1940s comic book. Hydraulic mechanisms are used to open up a secret tunnel beneath the tennis court, which can be opened and closed in a mere minute.

Inside, the garage doesn’t disappoint. With LED-lit parking bays, a tiled floor and an illuminated ceiling, plus walls lined with framed artwork, this is definitely a space befitting of Batman himself, and that’s before we even get onto the supercars...

But it’s not all about the glamorous garage, as there’s an equally striking entrance up into the property too. A sleek, modern staircase forms the connection between the new and old parts of the house, with an exposed brick wall and sash window offering a subtle nod to the heritage home waiting at the top.

Does this house look a little taller than average to you? This Japanese home was built in a residential area where all new buildings are required to be at least 23 feet tall. naf architect & design inc’s challenge was to build a traditional wooden house for their clients while still meeting this planning requirement.

The architects settled on a house designed around the concept of moving vertically through space. To do this, they installed three ways of travelling between floors – a climbing wall, ladders and a staircase. Imagine the races you could have!

While the climbing wall runs up the outside of the house through an external courtyard, the ladders run through the inside from the living room to a hobby room at the top of the property. These paths also allow light to travel through the house from top to bottom, making every room bright and airy.

At the very top of the house is a rooftop terrace surrounded by a six-foot wall, allowing the property to fulfil its minimum height requirement. Accessed by the climbing wall, the terrace features far-reaching views over the surrounding rooftops – a picture-perfect reward for adventurous climbers.

If you’re thinking that this Grade II-listed property in East Molesey, Surrey doesn’t look very British, you’re absolutely right. This four-bedroom chalet was once an elaborate garden feature for a country house in Switzerland. It was imported to the UK in 1882 and positioned where it now sits on the banks of the Thames near Hampton Court Palace.

Inside, vibrant decor and a bright colour scheme offer a striking contrast to the historic facade. Complete with a grand piano, living wall and illuminated spiral staircase, this dining room is made for entertaining.

But the home's biggest secret of all has to be the indoor beach tucked away downstairs, complete with underfloor heating and 40 tonnes of sand. Featuring potted palm trees and a tropical fish tank, the British landscape outside feels a world away.

Zoned into multiple areas for relaxing, drinking and dancing, the 68-foot-long beach is perfect for hosting tropical-themed parties, with a stage, speakers and skylights. If that wasn't enough, the chalet also features a bar, pool table, secret cinema room and wine cellar.

Feldman Architecture designed this San Francisco property around the playful personalities of a family with three sons. So, in true Peter Pan style, they created a house with a swing at the heart of the floorplan. Suspended down across two floors, the fun feature is surrounded by a metal wrap-around staircase.

The playful aesthetic continues throughout the rest of the house. Bright yellow dining chairs and colourful vegetation stand out against the white walls, while large windows draw in plenty of light.

The living room features a sliding partition that can be opened to connect the space with the garden, blurring the line between inside and out. Flowing out onto the deck and lawn, it’s the perfect way to make the most of the San Francisco sunshine.

Every big kid needs a bit of peace and quiet every once in a while. Luckily, this incredible house features a stunning roof terrace with panoramic views over the neighbourhood. True to form, the garden chairs are a sunny yellow, in keeping with the playful nature of the rest of the property.

Found just a stone's throw away from the Las Vegas strip, this unusual bunker home sits 26 feet underground, beneath a pretty ordinary-looking property. Essentially, it’s a secret house within a house – a subterranean playground hidden from the outside world.

Although the property can’t experience sunshine or rain, the lighting can be adjusted to reflect different times of the day. There are even twinkling lights on the ceiling that resemble stars, perfect for big kids who never want to go to bed.

The subterranean garden comes complete with fake grass and trees, as well as murals that mimic picturesque views. If that wasn’t enough, there’s also a four-hole putting green, swimming pool, barbecue area, dance floor, two hot tubs and a fountain.

Built in the 1970s, the quirky time warp home was created for Avon Cosmetics executive Girard Henderson and his wife, Mary, at the height of Cold War tensions, when fears of a nuclear apocalypse loomed. We can think of worse places to lay low!

This children’s bedroom in the Russian town of Dolgoprudny was designed by Ruetemple. Their clients wanted a way to keep their children occupied early in the morning and so this three-level playground was born, giving the parents a much-needed lie-in at the weekends. While it may be designed for children, we reckon it would be equally as fun for the young at heart too.

To maintain a calming environment, the spaces uses a minimalist palette of white and light wood, with the occasional grey furnishing thrown in. On the lowest level, a podium with mats forms a giant lounging area, perfect for napping, bouncing or even just kicking back and watching TV.

With steps leading up to two raised levels, there’s plenty of nooks and crannies to explore. White nets are used as balustrades to prevent the children from falling, allowing them to climb to the top unaided.

On the very top level sits a little playhouse – the ideal spot to play pretend and hide from grown-ups. We just love the clean, minimalist aesthetic of this space, offering a blank canvas where imaginations can run riot.

Sitting on a busy West London street, the Rainbow House is named after the multicoloured spiral staircase connecting its four floors. Interior design agency Ab Rogers Design finished every wall with white polished stucco, creating a blank canvas to allow the bright design elements, like this dreamy kaleidoscope staircase, to shine.

In the master bedroom, you’ll find a bright space with an uninterrupted wall of mirrors. Unless you look carefully though, you’re likely to miss the steam shower, bathroom and dressing room hidden behind the mirrors, as well as the steel slide concealed beneath the floor.

While it's almost completely hidden upstairs, the slide forms the focal point of the open-plan kitchen and living space. We can't think of a more fun way to make an entrance! We also love the convertible yellow sofa, which features an adjustable section in the centre that can rise or fall to create an extra guest bed.

No matter where you look, there’s something playful to catch your eye – and the flooring is no exception. Throughout the house, the floors are painted with whimsical illustrations by artist Richard Wood, making the house feel as though it's straight out of the pages of a children’s storybook. Who says homes can't be fun for grown-ups too?