The birthplace of America's favorite fruit-flavored mystery dessert.

This Corsican Neolithic site is full of pre-Roman megalithic structures that may or may not be penises.

These primitive rock paintings include a very beloved depiction of a woolly mammoth.

Trek into the depths of the cave where 17,000-year-old paintings exist alongside 400-year-old graffiti.

The final resting place of one of the first alleged vampires.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

No one knows who built this strange cave of worship or exactly why.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

One of the figures in this Celtic sculpture continues to puzzle archaeologists.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

The largest earthwork effigy in the world.

A small abandoned and abused cemetery that has become a magnet for ghost hunters.

The oldest house in Chicago certainly doesn't look the part and there are some who say it doesn't deserve its title either.

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.

The final resting place of up to 6,000 Confederate soldiers, the largest mass grave in the Western Hemisphere.

This modest post office sits on the site of H.H. Holmes' famous murder castle.

A strange and haunting monument of unknown origin in the historic Graceland Cemetery.

An enormous park-like oasis, full of famous Chicagoans' graves.

No one knows how many bodies are in this vault in a Chicago public park.

A shining sculpture made of 3,115 lights, the number of visible stars in the Northern Hemisphere.

These pretty kitties killed and ate as many as 135 railway workers.

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.