This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

Historical figures from New York City's Catholic community reside in Midtown.

A Manhattan Episcopal church with an eerie underground crypt.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

19th century cemetery hidden in Brooklyn's Prospect Park.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

The world’s first museum dedicated to the history of childhood opened in Edinburgh in 1955.

One of Scotland's most important modern structures, it just made the '100 Most Endangered Sites' list.

Abandoned former poorhouse, bible college, and haunted house in an Ohio hamlet.

Mussolini gave Cincinnati a bronze statue of Romulus and Remus suckling at a wolf's teats.

Where beautiful signs live on forever.

The museum calls itself the "National Museum of the Paranormal" and is full of eerie oddities.

The largest burial mound in the United States holds the remains of prehistoric West Virginians.

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

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

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

This woodland architectural installation acts as a camera obscura for the heavens.

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

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

One of the most important yet well-hidden museums dedicated to the history of medicine.

This university transit system is a 1970s vision of the future.

This New England covered bridge is home to the tale of a jilted lover known to haunt the area.