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

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

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

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

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

The oldest still-operating tavern in the United States was once owned by a pirate.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Louisa May Alcott based “Little Women” on her experiences growing up in this house with her sisters.

The poems Nathaniel Hawthorne and his wife Sophia etched into its windows are still visible today.

One of two lighted lanterns hung in the church belfry on the eve of the Revolutionary War to warn that the British were on their way.

Dedicated to one of the darkest moments in Irish history, this memorial has faced its fair share of backlash.

Oldest building in California still in use.

A former 19th-century tavern, famous for its peach brandy and honey concoction.

The grave of Mary Nasson is shrouded by witchy legends.

The first bell ever cast in Boston was cast by Paul Revere...and sounded terrible.

The world's longest known cave system.

Legend says train robbers stashed their gold within the depths of this unusual cave.

Make a wish at what might be America's only Catholic shrine to a sinner.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

This southwest-styled home in Santa Fe claims to be the oldest house in America thanks to an ancient bit of foundation.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

The ruins of an 11th-century Norman castle with a rare, perfectly circular shape.