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

An obscure waterfall that looks like something out of a fantasy novel.

Even Henry David Thoreau found this glacial pothole irresistible.

Reportedly 1,400 years old, this may be the first of the Fiji Mermaids.

Created hundreds of years ago, the magical follies and landscapes at this park were almost lost to time before being restored.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

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

This bridge is haunted by the ghost of a distraught mother.

Roman ruins top white travertine terraces formed by ancient hot springs.

Ruins of a 10th century church tucked away deep in a botanical garden.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

One of Japan's most famous sights, the bridge was originally built in 1673.

Rare recess caves fill this unbelievably beautiful Ohio park.

Abandoned concert venue legendary for its rock counterculture.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

A bigger-than-life pun that has become a beacon of altruism.

This crumbling UFO is one of only a few remaining "moveable ski chalets" of its kind.

When the rain falls, this drain system turns into a musical instrument.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

Extraordinary sculpture garden created by an eccentric English poet.

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