The most mysterious feature of the home lies outside the main house. Known as the ‘Portal of the Guardians’, a long tunnel leads from a central fountain to an Initiation Well, which descends 88 feet (27m) underground.

The well consists of nine levels lined with Ionic columns, said to represent the nine founders of the Knights Templar or the nine circles of heaven, purgatory, and hell in Dante's Divine Comedy.

While the exact purpose of the well can't be known for sure, it's riddled with symbols of the Knights Templar, leading many to believe it was used for initiation ceremonies.

The most mysterious houses around the world