Hundreds of prehistoric stones, arranged in perfect lines in a French field.

This small island, a byproduct of 19th-century canal construction, is now home to a charming Japanese garden.

These red marks, seemingly placed at random, are in fact not.

This tiny hotel perched atop a 50-foot tower really puts things into perspective.

A massively oversized measuring tape sculpture sits inside a hidden yard.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

The sunken structure looks like the victim of a catastrophic flood.

An aluminum skeleton brings Chinese mythology to the French shore.

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

This statue honors the thousands of Allied avians that served and died for France during World War I.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

An engineering marvel at the time of its construction, this cross-border waterway sought to connect the Black Sea to the Baltic.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

This abandoned church in central Lyon is missing its front stairs.

Hundreds of hidden passageways weave through the old quarters of Lyon.

Peeing dogs guard the Roman hunting goddess atop a fountain at France’s Château de Fontainebleau.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A fortified palace in the shape of a ship on the Thiou river.

The world's largest second-hand graces a clock surrounded by constantly changing flower beds. 

This stone in Lake Geneva was once the reference point used to determine altitude in Switzerland.

An opulent monument built for a duke who donated his entire fortune to the city of Geneva.

Lyon's miniature version of the Eiffel Tower was built as a statement in support of French secularism.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

Lyon's "Wall of the Silk Weavers" is one of the largest murals in Europe.