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

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.

An abandoned tuberculosis hospital said to be haunted by the patients who died within its walls.

This giant sculpture made of trash is a critique of society's wastefulness.

A hidden three-foot-wide house separates these two regal churches.

This castle has links to Portugal’s founding and struggles for independence.

Elaborate tile work in this railway station tells the story of Portugal.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

This ship offers visitors the chance to spend the night aboard a former floating hospital for fishermen.

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

A replica of the Roman emperor in glorious full color.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

Pilgrimage site for star-crossed lovers.

Stockholm's deepest subway station is also a stunning ecological wonder.

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

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Now home to a drinking establishment, this building has a macabre history.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

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

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

This tiny tropical village was sick of anonymity so the locals made this sign, which actually changed the name of the town.

Shipwrecks, ruins, and turtles are all that remain on this haunting Caribbean ghost island.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.