The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

Once a black market electronics marketplace, now an otaku shopper's paradise.

A black cat protests the City Guild in Riga's Old Town.

Flamboyant architecture from the turn of 20th century.

Spend your honeymoon where the Devil had his wedding.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

The oldest operating pharmacy in the world features 800-year-old recipes.

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

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

Giant topiary dog once played a role in a terrorist bomb plot.

An ancient knight and a symbol of the city's freedom.

Gargoyle head that brings good luck.

Celebrated example of Ottoman architecture that also served as a site for brutal massacres.

These warring psychedelic crags commemorate an unsuccessful military operation.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

It houses the remains of a 17th-century version of the Titanic.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

Monasteries on rock pillars, once accessible only by frayed ropes.

An ancient octagonal weather station named for the eight Greek gods of wind.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.