The Syrian headquarters of alleged hashish-smoking assassins.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

Ruins of the Crusaders' headquarters.

Mediterranean castle on a tiny Turkish island.

Sex curse discovered on ancient tablet in Cyprus.

Civil War Fort on an island in the Boston Harbor.

This attraction was abandoned after the Chernobyl disaster.

"Excuse me sir, your submarine is blocking my building."

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

Scary metal statues adorn some of the signature buildings of Burlington, VT.

Science fiction's grandfather has a fittingly marvelous tomb.

A monument to the military service of America's greatest traitor refuses to even name him.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

In an area where the remnants of WWI are discovered on a regular basis this preserved frontline trench may be the most amazing.

An encyclopedic collection of mammal penises.

The site where one of the most famous poems of World War I was composed is preserved to honor the legacy of the work.

A taxus-tree to which Julius Caesar reputedly tied his horse.

Underneath a chalk hill in France lies what Hitler hoped would be the underground launching base for a devastating new weapon.

This simple stone memorial remembers a secret, Geneva Convention-defying interrogation base from WWII.

This Gothic Revival castle used as a shooting location for "The Secret Garden" and other films.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.