Elevated freight railway turned wildly successful urban park.

A cave network located at the southernmost tip of mainland Greece was once believed to be an entrance to Hades.

According to myth, Zeus himself was hidden in this cave to escape being eaten by his dad.

Walrus skulls and narwhal bones were found here while excavating a 900-year old church.

Neither bomb blasts nor heartbeats escape the giant ears of this super sci-fi Arctic outpost.

A Cold War atomic camp buried under the ice is now emerging because of global warming.

An experimental forest at the foreground of arboreal science is also the canary in the coal mine for climate change.

The world's northernmost flowers cling tenuously to life on desolate Kaffeklubben Island.

Abandoned railway line circling the city of Paris.

This chimerical bridge/tunnel appears to dead end right into the sea.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

Legend says a witch conjured the world's third largest whirlpool to protect Scotland from a nasty pirate.

This ethereal, rainforest-like gorge is home to waterfalls, quaint bridges, and fairy folk.

This Scottish bridge seems to compel dogs to leap to their death.

A small island abbey is the final resting place of many medieval Scottish monarchs, including the real Macbeth.

This allegedly haunted 16th-century tower house-turned-museum exhibits thousands of spectacular objects.

The last inhabitants of one of the U.K.'s most remote islands were evacuated in 1930.

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

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

Spend the night in this formerly abandoned traditional Scottish village.