Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

A beer pipeline runs beneath Bruges.

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

A Museum of Psychiatry in a still-operating mental institution.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

According to this bar, God gave an “11th commandment” to Antwerp: Thou shalt drink beer.

This statue dedicated to the story of a Flemish boy and his dog was relatively obscure in Belgium, but a cult sensation in Japan.

The tallest mountain in mainland Netherlands isn't actually very tall.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The remnants of an abandoned, 19th-century gold mill along Aruba's rugged northeastern coast.

A safe place for the wild donkeys of a hot vacation destination.

Amsterdam's former hotspot for public executions and dissections.

A public urinal so pretty, it was declared a national monument.

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

A beautifully eclectic mix of architectural styles.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

A strange aquarium with stuffed fish, and almost no water for them to swim in.

A preserved oasis with traditional Andalusian-style architecture and beautiful views of the Nile.