An institution dedicated to the towering buildings that make up skylines in New York City and around the world.

This 150-year-old train station and caboose have been turned into a railroad museum, enjoyed by young and old alike.

The radio station that's been promising to make love to you for the last 15 years—if you happen to be on one specific block in suburban New Jersey.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

Where America's first doomsday cult awaited the end of the world.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

Over 50 whirling pools left behind from the glacial age.

The largest known open fault in the United States is basically a giant natural refrigerator.

Eight whimsical acres of metal art.

A nearly 100-year-old dining car in upstate New York embodies the golden age of roadside dining.

One man's swirling six-acre monument of stone.

The world's largest kaleidoscope, designed by a 1960s psychedelic artist.

A beautiful multicolored mound formed by the mineral deposits of the Orenda Spring.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

Thousands of bottles that have held everything from poison to perfume make up the collection of this small museum.

A beautiful, historic location open to the public.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

A collection of haunted artifacts chronicles the career of the world's most famous paranormal investigators.

At this site, two historic stone bridges spanning the Sing Sing Kill—one right on top of the other.

100 massive sculptures in the Hudson River Valley.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.