A complex, nine-layer maze on the grounds of a Venetian doge's playground.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

An ancient artistic garden parlor full of hidden water wonders.

A once-luxurious, now abandoned hotel in the Italian Alps.

Once the most densely populated place in the world, this island is now a ghost town.

The abandoned Japanese amusement park once loomed as a dystopian Disneyland.