Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

A crumbling hospital from the 1850s on Roosevelt Island.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

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

An occult-y, historic hotel with the World's Largest Ouija board on the roof.

One of the oldest Catholic churches in the U.S., situated just east of Gettysburg.

An Olympic hero stripped of his medals is buried in a town he never visited, which took his name after his death.

It marks the spooky spot where the bodies of two young boys were found in the 19th century.

A rock maze opens up to a panoramic viewpoint at an abandoned mine full of ghost stories.

A soon-to-be-forgotten roadside spectacle loaded with local lore.

A preserved 18th century homestead in Western Pennsylvania marks the spot where the Whiskey Rebellion began.

The site of the little-known Pennsylvania battle that sparked the Seven Years' War.

The final resting place of the Hollywood star who came to a tragic end.

A diorama of the Civil War, fought by cats.

A living maritime paradox still floats in the same lake where it was built and resurrected... or was it?

A hidden piece of Altoona's railroad history in a long-forgotten abandoned town.

The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.

This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

The final resting place of two members of the infamous Doan gang, notorious outlaws and Revolutionary War Loyalists.

This public park was the site of the largest civilian disaster of the Civil War.

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

Locals call this magical moss-covered walkway the "Emerald Path."

The famous bell was secreted away and hidden in a church in Allentown during the British occupation of Philadelphia.

An otherwise quiet campground becomes a bustling medieval town for two weeks every year.