The "mysteries" of this quintessential roadside oddity were almost destroyed by neglect but were saved by fans of kitschy wonder.

This abandoned amusement park was built on a site with a dark history.

A decorated war pigeon stands guard in eternal taxidermied rest at his alma mater.

This hospital fell into ruins after failing to act as the advocate for the mentally ill it was designed to be.

Featuring the the longest lift span of any vertical-lift bridge in the world.

The first partially complete dinosaur skeleton was discovered here, forever changing the world's view of the ruling reptiles.

These 20-foot sculptures will help guide you from the local train station to the local sculpture garden.

A bronze plaque at an intersection in Hoboken marks the place where the game of baseball first took shape.

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.

A farm in New Jersey grew a most unusual crop for AT&T's testing purposes.

A playground inspired by differential calculus dangles from the ceiling of the Liberty Science Center.

This tiny structure was built by the creator of the Brooklyn Bridge.

Rusting away on the edge of New Jersey are the remains of a Cold War missile launch site.

The remains of an old sawmill, gristmill and the surrounding industry dating back to the 18th century.

A completely round house designed for the Atomic Age.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

The historic home still shows the scars from a little run-in with the British in 1813.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

This strange, big-tailed beast became a Pennsylvania town's unofficial mascot.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

This collection honors the iconic, and proudly American lighter that just won't quit.