These homes carved into the mountains seem to defy the laws of nature.

The central mosque of this Mali town is entirely built from mud.

Inside a former cabaret, seven floors of erotic art.

The lost Latin words were reconstructed using the holes from the nails that once pinned them in place.

After immigrating to Paris in the 1970s, two brothers from Laos built a grocery store empire.

This tower is one of the best-preserved (and least-visited) remnants of medieval Paris.

This 400-year-old tree is actually an immigrant from North America.

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

Guests can stay at a hotel in the former French abbey where lie the tombs of King Henry II and King Richard the Lionheart.

Jean Tinguely's bizarre monster sculpture is hidden deep in a forest.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

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

This ancient theater was once the home of fierce gladiatorial battles.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

The artist and his brother are buried in a landscape straight out of a van Gogh painting.

Historic medieval fortified city in southwest France.

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

France's most famous cemetery, with some of its most curious tombs.

This historic building displays the remains of a victim of the devastating 14th-century plague.