A small square plaque marks a failed assassination attempt that could have changed history.

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

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

This massive redwood tree has a hole in the base big enough to drive through.

Mysterious meeting place for UFO hunters near Area 51.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

An odd little fishing town that is inundated by tourists looking to be locked up in a cage and surrounded by great white sharks, because why not?

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

Site of the largest impact event to occur over land in Earth's recorded history.

A monument to the center of the North American continent may be off by a few miles.

Small plaque marks the spot, but the true center is located about half a mile away on a private pig farm.

A monument celebrating the idea of reaching inaccessible places.

A castle built for love, and abandoned due to heartbreak.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

This small red school was where Germany signed their surrender during WWII.

In this century-old literary safehouse, print is alive and well.

The hotel room where Janis Joplin tragically died has now become a makeshift shrine to the singer.

This public park was the site of the largest civilian disaster of the Civil War.

This small Bavarian graveyard is filled with empty graves for German soldiers lost during the World Wars.

This tiny museum kept in a B&B laundry room holds the death mask of notorious bank robber Pretty Boy Floyd.

Tropical paradise strewn with hundreds of World War II wrecks.

Bananas are often left for the first monkey America ever recovered alive after being launched into space.

Charleston's historic city jail once held everyone from pirates to Civil War POWs.