The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

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

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 handsomely carved wooden church is more than 800 years old.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

This floating sculpture of ice is a poignant reminder of nature's power.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

A little sculpture with a large wardrobe.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Breathtaking and huge 430 year old maps of Italy.

A marvel of Byzantine engineering under the streets of Istanbul.

This dazzling Buddhist temple was constructed from over one million ceramic tiles salvaged from a British shipwreck.

This gem-encrusted temple is said to contain some of the Buddha's hair which can make the deaf hear and the blind see.

Over 2,000 ancient temples dot the Myanmar landscape at the site of this famed archaeological site.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

An eerie reminder to the horrors of World War II.

Peace Park and the Atomic Bomb Dome.

Japanese national treasure originally built in 593 CE.

A contemporary fresco movement illustrates the region's rich history.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.