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.

The Pope’s secret escape route.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

1513 Turkish world map, full of European state secrets and snarky commentary.

A marvel of Byzantine engineering under the streets of Istanbul.

Marked by the hand of the explorer Henry Morton Stanley.

17th century mosque for Shah Abbas' harem.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

The palace of the King of Kings, burned by Alexander the Great.

An ancient temple to the Hindu god Shiva surrounded by jaw-dropping scenery.

Huge herds of Asian elephants can be seen walking, bathing, and just chilling at this Sri Lankan park.

A Bohemian "anti-hotel" offers off-kilter stays in Sri Lanka.

Once thought to be the Garden of Eden it holds a holy footprint claimed to belong to Adam, Buddha and Shiva.

An ancient stone fortress considered by many to be the eighth wonder of the world.

After a 2004 tsunami, this stranded boat was left in place.

The most playful of the life-sized statues that make up Singapore's "People of the River."

Colorful umbrella-covered trees in Singapore's Little India look straight out of Dr. Seuss.

Singapore's landscaping project is home to 18 incredible Supertrees.

Artifacts and memories from the Vietnam war, located in a place that experienced it first hand.

This striking landscape in northern Vietnam contains both geological and archaeological wonders.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

This bridge made famous in a novel and on-screen wasn't actually built over the river Kwai.

The skeletons, demons, and corpses serve as a warning of the terrors of Buddhist Hell.