These steeply terraced ruins are a stop along the Inca Trail to Machu Picchu.

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.

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

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

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

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

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

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

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

A monument to the conquistador became increasingly controversial in the very city that he founded.

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

A walk through the historic city center, under the streets of Seattle.

A giant Troll lurks under one of Seattle's oldest bridges.

A wall of chewing gum moonlights as collective art.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

Wedged between two sets of row houses is an awkwardly located family graveyard.

An abandoned church gets a second life as a massive beer hall and event space.

Fiji mermaids, mummified remains, and recreated cryptids are among the morbid oddities at this Maryland museum.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

A striking memorial to the 21 lives lost in an explosion at the Washington Arsenal

This apartment building designed by a notable Washington D.C. architect housed the Qing Dynasty's Legation.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

This fertility idol of questionable authenticity inspired an iconic Indiana Jones artifact.

An amazing example of early-20th-century architecture, this church features marble transported from Utah.