A community of artists and entrepreneurs seeks a simpler life on London's waterways.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

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

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

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.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

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

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

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

Flamboyant architecture from the turn of 20th century.

Stare out over the lagoon and beyond from this 10th-century campanile on the island where the city of Venice began.

The only museum with its curator—and her pets—buried inside.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Jesus' footprints and the first catacombs in the world.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

These enlarged egg sculptures represent the native birds of eastern Iceland.

This stunning concert hall has become a symbol of Iceland's national recovery.

Three columns of volcanic rock shoot out of the ocean.