Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

The oldest church in the Estonian capital is home to over 100 fantastical cemetery coats-of-arms.

This no man's land slicing through the island is strewn with abandoned relics of another time.

This former shopping center now acts as the eccentric lair of the Venezuelan secret police and their shadow prison.

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

The crumbling remains of a once-grand building.

Climb to the top of the world's largest seated bronze Buddha.

The ominously named cave is home to some remarkable ancient art.

A Christian monastery stands on what was once a holy Incan temple.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.

The little bear in the "funny kind of hat" has made his way from London back to Peru.

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

A painting in the historic Cathedral Basilica depicts Jesus and his disciples dining on a traditional Peruvian menu.

This large round boulder is said to emit spiritual power, but it may just be magnets.

An unexpected desert oasis in South America.

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.

Visiting dignitaries and Hollywood stars once stayed at this 1920s hotel, alongside ghosts that are said to haunt its corridors.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

The world's most remote airport.

This was once the center of the Birdman cult, and is now a World Heritage Site.

The largest stone moai on Rapa Nui.