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

This impressive chasm is one of the longest natural underground cavities in the world.

To the famous surrealist artist, liberty required two torches held high.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The birthplace of the ferocious William the Conqueror, this castle is awash in medieval history.

An ancient ossuary in Rouen.

This symbol of the French Revolution still stands where it was first planted during the 18th-century.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.

A former fisherman's hut deemed too small for habitation is now a delightful tourist draw.

A subterranean playground in an abandoned slate mine.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

A tiny village in Wales claims the name of a noble medieval hound slain for a crime he didn't commit.

Ho Chi Minh's perfectly preserved body has been on display here since 1975.

The embalmed remains of the communist leader lie within a custom crystal coffin.

A tall karst islet popularized by 007.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

One of the best collections of wax anatomical models in the world.

Traditional architecture and ancient irrigation systems are on display in this gorgeous mountain village.

This beautifully restored fortification kept the city safe for centuries.

An underground city of salt.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

This giant, granite purse is one of Melbourne's most unique and distinctive pieces of public art.