On the outskirts of Pennsylvania’s capital city, a reminder of the worst accident in U.S. commercial nuclear power plant history.

This dramatic rail curve was once the target of a failed Nazi attack.

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

This covered bridge was used by both Union and Confederate troops during the Battle of Gettysburg in 1863.

Long before the Battle of Gettysburg occurred, dinosaurs roamed the area and left their footprints on this bridge.

This monument marks the beginning journey of a wounded soldier's leg that ended up almost two states away.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

The smallest covered bridge in Maryland.

This hidden treasure provides a charming access point along the south side of Baker Park.

Manhattan's deadly West Side railroad, which killed hundreds of New Yorkers, is remembered by this simple plaque.

One of the last full-orchestra recording studios in New York City and an acoustical marvel.

Once considered the height of medical modernity, this structure is now the oldest remaining component of Roosevelt Hospital.

From this desk Al Hirschfeld drew his influential caricatures of the 20th century's Broadway stars.

Two large-scale sculptures of Adam and Eve greet visitors in the nude at the Time Warner Center in NYC.

Discover the taste of mold.

The oldest living tree in Manhattan comes shrouded in sinister legend.

A giant scrap metal troll rests his hands on top of a dilapidated building covered in graffiti.

Dedicated to one of the most successful boxers to compete in the heavyweight division.

The graves of a Connecticut family thought to have been plagued by a vampire.

Dedicated to a legendary spiritual vision.

An industrial waste tourist attraction.

The longest-covered bridge in the state of Maryland.

The Decoy Capital of the World.

A field of nothing but boulders which resembles a giant's gravel driveway.