Colorful murals by Jean Cocteau hide within this peaceful London sanctuary.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

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

A "miracle" that seems to produce more holy fistfights than holy revelations.

Mysterious Incan ruins on a tiny island in Lake Titicaca.

Popular tourist destination where witches in dark hats sell dried llama fetuses for good luck.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

One of the largest ancient geoglyphs in the world is a tall desert god used for predicting the weather.

The largest stone moai on Rapa Nui.

The world's most remote airport.

Thailand's country villages continue the tradition of gong-making, and invite visitors to watch the process.

A shrine built to combat the bad karma of a commercial venture.

The long underground cave's curiously shaped stalagmites have inspired many legends.

A modern temple with an ancient philosophy.

Bangkok's men with dangerous jobs come here in search of protective talismans.

A limestone wonderland of water and subterranean secrets.

A tea party concludes each visit to this Russian spice cookie sanctum.

This 15th-century cave complex is one of the very few monasteries to stay open throughout World War II and the Soviet regime.

Church built on the site where the last tsar of Russia and his family were killed.

This Russian religious complex is a Frankenstein's chapel that includes influence from almost all the major faiths.

Palace where the nearly un-killable Rasputin was murdered.

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

Known as the Hintz House, this medieval pharmacy has been an apothecary's haven for nearly 450 years.