Several times a year, during low tide, two pairs of historic train tracks are revealed on this New Jersey beach.

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

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

The beloved, war-tested mascot of a Union regiment graces their battlefield monument.

Scenic mount trashmore, Virginia Beach's most curious waterfront still has a couple of secrets.

Unknown to many, this sparkling turquoise lake hides amid Oregon's snowcapped mountains.

The fastest transatlantic ocean liner sat abandoned in a Philadelphia shipyard for decades.

Memorial built in 1922 in remembrance of WWI casualties.

Step inside Lucy, the world's largest "elephant."

A granite monument honors a beloved World War II canine mascot.

A unusual sanctuary for abused and exotic animals in South Jersey.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

Nuclear reactor created the plutonium used on Nagasaki.

A bust of the first president welcomes visitors to the only town in America called George, Washington.

A cave interior in the shape of the ancient rhinoceros, created by lava cooling around its carcass.

Site of the greatest known waterfall that ever existed.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

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

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

Where a rare geological phenomenon created a section of rock that resembles a checkerboard.

The world's smallest drawbridge.

The final resting place for Bermuda's British military, including a man who died of sunstroke.

Once a strategically imperative naval base, portions of this Bermuda dock complex now serve cruise ships.