This stone tower marks a lookout point over the historic Washington Crossing, and maybe some buried treasure.

This giant disembodied horse head seems to balance impossibly on its nose.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

Abandoned for over a century, this chilling train tunnel is now a destination for ghost hunters.

The absurd creation is a compulsory destination for selfies in Buffalo.

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

Buffalo's abandoned concrete grain elevators are getting a second life.

A forsaken wonder in the middle of the East Side neighborhood.

This great stone guardian of the forest is a relic from the land's volatile volcanic past.

Post office plaque commemorates local resistance to a cult invasion.

This picturesque stream was up until recently the site of a ten story mountain of slag and sewage.

This secluded walking trail is a hidden gem of a Pittsburgh park.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

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

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

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

White llama terraces dazzle in Peru's "other Machu Picchu."

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

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

The ghostly remains of what was once the world's richest copper mine.

Buy your friend a drink or staple some cash to the wall for the next guy at the Salty Dawg Saloon.

The rusting hulk of a hand-powered, nearly 160-year-old submarine abandoned in 1869 due to the ravages of decompression sickness.