Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

One of the oldest surviving lock houses on the Ohio River.

This Art Deco service station has been providing tune-ups and turning heads for close to a century.

A 20-foot-tall quarter commemorates George Washington’s ties to Bedford County.

Built in the 1970s, this curious modular home found new life as a sundae-shaped ice cream stand.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

This titanic java kettle is one of the many kitschy landmarks located along America's OTHER famous highway.

An abandoned stretch of highway, deteriorating next to the operational one.

The remains of a century-old mansion that met a fiery demise years after it was deserted.

This haunting monument honors the victims of 9/11.

Nassau Hall has served as army barracks, a museum, and played a key role in the American Revolution.

Take a step into the workshop where Edison and his employees revolutionized the world.

A simple plaque remembers an act of WWI terrorism that obliterated an island and forever scarred the Statue of Liberty.

In the power of this waterfall, Alexander Hamilton saw the potential for industry.

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

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

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

Destructive children, start your engines.

Once the world's largest reinforced concrete structure, this abandoned bridge now beckons urban explorers.

One of the world's largest model railroads is a mind-boggling achievement.

A bronze monument to the infamous radio broadcast in the real New Jersey town where the fictional Martians crash-landed.

World War II bunker still standing on the New Jersey beach.