These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

A curious little museum dedicated to the furry feline in the cat haven that is Old Town Kotor.

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

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

Huge stone depressions which may have acted as an Incan agricultural experiment.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

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

A fascinating little museum all about the rich history of Peru’s famous plant.

A backdoor to Machu Picchu that only the most foolhardy infiltrator would attempt to breach.

Did Inca children also slide down these smooth rocky slopes above Cusco?

It took 82 years and four different plaques to finally get the story right.

An Inca spa, military outpost or maybe… both?

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

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

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

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

This outdoor sculpture gallery is a modern-day homage to Andean culture and history.

A man-made island fort that has housed soldiers, scientists, and ravers.

The Guardian of Tallinn.

"There's nothing there," and other lies the KGB told us.

Only a fragment of this 15th-century Dance of Death survives today.

The oldest continuously operating pharmacy in Europe.