What was once the base for Russia's first nature reserve is now a ghost town, right on the shore of Lake Baikal.

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

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

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

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

This remarkable cave was discovered after a shepherd watched bees enter and exit through a small fissure.

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

Thousands of rusting train cars have been slowly falling apart on the edge of Greece's second largest city.

A spectacular cave and a beguiling lake.

This legendary city has been a tourist attraction for centuries.

Monasteries on rock pillars, once accessible only by frayed ropes.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

In the early 1800s, surgery was also a show.

A layered tribute to the work of mosaicist Isaiah Zagar.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

Dr Barnes' $25 billion private collection of art and arboretum.

Beautiful natural falls where Satan once ruined a pot of beans.

Former abode of notable poet, complete with literary references and stories of ghosts.

A man killed in a hunting accident is eternally guarded by a granite hound tombstone.

A son-and-daughter meat market, hawked by mom and dad.

Leave the wardrobes and sweets to British schoolchildren, Shanghai's got a Coke machine that leads to booze.

9,000 years of carnal history is on display at China's original Museum of Sex.