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

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

This simple convenience store sits on the location where the Ouija board was named—and has a plaque to prove it.

This lovely tree was a thank you gift from the man known as "Public Enemy No.1."

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

A historic arena where the Beatles played their first concert in the U.S.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

Washington's iconic carousel has a nice piece of Civil Rights history.

There’s a hidden military meme engraved on the World War II Memorial.

This unassuming passageway played a key role in one of the most important events in U.S. history.

A brass plaque dedicated to a convicted cannibal hangs in the National Press Club, and that's not even the craziest part of the story.

The birthplace of the alleged inventor of baseball.

The original Uncle Sam was actually a New York meatpacker who is buried under this historic grave.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

The 3.8 billion-year-old rock proves that tectonic plates may have been shifting longer than we thought.

This remote Moravian mission brought Christianity—as well as devastation—to the Inuit people.

The remains of a sunken military ship wreck visible through clear water.

Now abandoned, the world's first torpedo factory is crumbling into the sea.

A sad reminder of the World War II bombing stands largely unnoticed on a street corner.

The site where a nuclear bomb was lowered over 8,000 feet underground and detonated as an experiment in natural gas extraction.