An unassuming music museum recounts the rags to riches story of a dramatic Portuguese genre.

One of the smallest bookstores on the planet.

At this cozy bar tucked down a hidden Galway backroad, Guinness makes the Gaelic come out.

For a brief time in 1960s France, families could climb into a tiny submarine and be pulled along an underwater journey.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

This building has two facades of clashing architectural designs.

A Montreal deli that was so beloved that it was allowed to circumvent their laws of language.

The castle still holds traces of the abandoned Roman fort it was built atop.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

The footprint of a frustrated devil in Munich's Cathedral.

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

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

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

Walk through the history of a Dutch truck manufacturer, from 1928 to today.

Watch the local Netherlands birds from inside this giant eco-egg.

A radio telescope for listening to the stars, based in one of the cloudiest countries in the world.

The 20-mile causeway that separates the Netherlands from the sea.

Atop this former dutch railway office sits an interstellar work of art.

This neighborhood of futuristic ball houses looks like an alien settlement in a science fiction film.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

The giant scales in this museum can still tell if someone is one of the devil's brides just by weight.

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.