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

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

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

Sleep in a glass pod dangling off a cliff.

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

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

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.

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

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

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

This historic building housed the surviving crew members of the Titanic, who were left destitute after the wreck.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

A dilapidated dock tells the story of Titanic's missed arrival.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A forgotten relic from New York's bygone trolley system hides in plain sight under a bridge.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

Site of the first pathological and bacteriological research facility in the United States.

One of only two commuter aerial tramways in the United States.

A sculptural commentary on capitalism pokes up from the East River.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.