Climb inside an iron crystal magnified 165 billion times its normal size.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

This house's itty bitty size means no humans allowed.

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

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

A huge Megalithic chamber tomb located behind a cafe.

His "Lionheart" is entombed separately from the rest of his body.

An ancient ossuary in Rouen.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

This demon atop the Notre-Dame de Paris looks utterly bored.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The video game-themed street art first popped up in the French city.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The oldest stone house in Paris was built by its most famous alchemist.

A building so large that it has its own weather.

Ancient serpentine sacrifice holder that has stood the test of time.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

A mysterious ancient cemetery with Roman sarcophagi and Lycian inscriptions.

The ancient latrines of the Greeks, in all their public glory.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.