A steaming, boiling hellscape sources Hokkaido's thermal baths.

A gorgeous, nostalgic café housed in a lofty old warehouse, lit only by petroleum lamps.

This dazzling three-story shop showcases the art and history of music boxes, a popular novelty in Japan.

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

A daily pyrotechnic celebration marks a beloved tradition during Valencia's festival season.

Once a spa resort, then a tuberculosis sanatorium, and now a crumbling ruin.

A massive explosion that leveled hundreds of buildings in the city of Leiden is remembered by a waterside plaque.

Only a few walls remain of the last church the Pilgrims used before they sailed to North America.

A trio of red, white, and blue stones embedded in the streets of Leiden are markers of medieval territory and law.

This public library and its impressive collection of academic books have not changed since the 17th century.

Science meets wall art to highlight the beauty of famous mathematical equations.

An ancient Egyptian temple sits within a modern European museum.

Europe's first floating restaurant is home to a hilarious legend.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

Where royalty waits in the height of luxury.

A beautifully eclectic mix of architectural styles.

The former headquarters of history's oldest megacorporation.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

Colorful and chaotic stacked hotel in North Holland.

The place where Czar Peter I of Russia resided in 1697 during his Grand Embassy.

Graffiti covers the walls of a room where university students through the centuries have waited nervously to defend their theses.

Devious political maneuvering and four ancient, working telescopes are central to the world's second-oldest observatory.