This "floating railway" is one of the world's oldest monorail systems.

Art and a pun, all in one.

A musical instrument played by the sea.

This one-time health resort was used by aristocrats around the world.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A series of modernist treehouse hotel rooms grace the outskirts of an Arctic forest.

Lavish royal estate punctuated with heated greenhouses.

Moss and stone turn this waterfall into an otherworldly liquid veil.

A unique attraction and museum dedicated to exploring iconic roadside structures.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

An "anarchical" no man's land, complete with garbage sculptures and a hobo-run "Landfillian Library."

400-year-old garden, restored to beauty.

A town church once nearly submerged by the damming of a river is now hauntingly visible as the water recedes.

Giant, pink stuffed rabbit on an Italian mountain.

Isolated atop this Balinese sea crag is a lovely Hindu temple that is said to be guarded by sea snakes.

The hidden jewel of Disneyland: a members only playground for the Disney elite.

Acres of natural wonders left behind by a socialite-turned-gardener.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

An unassuming secret door once led to a legendary watering hole.