A museum dedicated to the history of the diamond trade in the Netherlands.

The world's oldest Jewish library was founded by Sephardic Jews in 17th century Amsterdam.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

Statues of a fire-breather, a clown, and a whole performing troupe celebrate Luxembourg's creative side.

This small chapel built into rock is the oldest place of worship in Luxembourg.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

A lovely biographical museum in the artist's home of 24 years.

Cozy basement bar sports an inventory of over 2,000 beers.

A large portion of this navigable canal runs under Paris's famed boulevards.

This 18th-century sundial was designed to calculate the date of Easter each year.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

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

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

Indents in the pavement are all that remain from a grisly death machine in Paris.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

The pockmarks across the building's facade are remnants of the Blitz.

This intricately carved and hilariously huge bed was such a famous symbol both Shakespeare and Byron used it in their writing.

A masterpiece of Gothic-Mudejar design in Ciudad Real.

This perfectly conical hill in the La Serena reservoir is humorously known as Europe's Largest Roundabout.

This sculpture of a rider on horseback once crowned the tomb of an Iberian aristocrat.