Once the most densely populated place in the world, this island is now a ghost town.

On Japan's Tashirojima Island, cats are king.

An exquisite tunnel of cascading flowers.

A magical place that lets you play in and explore the world of Studio Ghibli.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

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

This abandoned fortress still stands guard over the Guadiana River despite a history of warfare.

Dead weights honor the dead of Portugal's fishing industry.

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

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

Houses are tucked between, on, and underneath giant boulders.

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.

The first skyscraper to include a Ferris wheel built into the facade.

The decaying remains of a once-luxurious Soviet spa town.

Fast food feels like fine dining at this award-winning modern Georgian building.

A literally moving statue of stacked metal giants just continually trying (and failing) to find love.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

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

Cat art as far as the eye can see.

The world's only museum devoted to the wonders of fluorescence.

Museum preserving torture methods from the past.

A semi-abandoned village destroyed by U.S. bombings during World War II dominates the valley of Turano.