Copenhagen's celebrated theme park and gardens.

Countless grotesque faces stare out from this eerie Prague art wall.

This former fascist summer camp was abandoned for decades.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

A vintage video game wonderland in downtown Reykjavik.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

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

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

This cemetery features modernist statues as strange as its name.

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

The astonishing collection of an infamous criminologist.

Venice's "Island of the Mad."

The largest library in Latin America owes its existence to an Old World earthquake and a Napoleonic invasion.

Twice a day a speeding train passes only inches from the homes of this residential neighborhood.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

Cretean quarry suggests real-life site for ancient Greek myth of the man-eating Minotaur in his labyrinth.

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

A 20-meter (65-foot) robot towers over Tokyo Bay.

After a profound show of devotion for his master, a dog becomes the symbol of loyalty for an entire nation.

This faux-seedy Japanese arcade is made up to look like a maze of alleys straight out of a cyberpunk dystopia.

The remains of a British railway rusting in the jungle mist of a Brazilian mountainside.

Crumbling remnant of Rio's colonial past tucked behind Corcovado mountain in the neighborhood of Cosme Velho.

Estonia's largest creative city is a vibrant bohemian hub located within a former industrial complex.