Originally built to monitor fishing, this Victorian tower now educates visitors about the local salmon industry.

A hugely vast Irish landscape of barren rock that stretches for miles.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

Double spiral staircases are not unheard of, but they are very rare.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

A series of playful yellow penguins share a serious message about the environment.

One of the famous Czech artist's lesser-known Prague installations appears to be a glowing fetus affixed to a drainpipe.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

Walk through Czech history in Prague's largest graveyard.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

An unusual bronze bus shelter is actually an art installation commenting on the city's history with the Nazi party.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

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

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

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

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

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

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

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

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

The atmospheric road was never meant to be so creepy.

A striking, modern church devoted to a nun who loved God and beer.