A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

This frequently-photographed waterfall takes only a short hike to visit.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Amsterdam's Red Light District leaves little to the imagination.

One man's swirling six-acre monument of stone.

What was once a trend-setting, phrase-coining icon of architectural splendor is now a rotting, forgotten hulk.

Along a California highway is a kind of Jurassic Park made of metal.

Ancient paintings known as the "Sistine Chapel of Cave Art."

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

This naturally-sourced hot spring is now home to a clothing-optional resort.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

Delightful disarray of found objects and clutter.

This expansive bridge in the Canadian wilderness was originally just built for friends.

Architectureal fantasy quarter of Rome.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

Half of a waterfall goes into the river while the other half seems to disappear.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

This 16th-century monastery has been turned into a surrealist architecture compound.

The most visited, and possibly most controversial, museum in Germany.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

An eccentric inventor's castle home with its own indoor weather system.

A 140-year-old castle with underground caves hidden in San Francisco.

A museum of carnival attractions where you are invited to ride the rides.