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

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

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

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

Hot Doug's "Hot Dog" Stand.

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

Trade in that pesky human soul for cold-hard circuits.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

London's smallest police station is barely the size of a phone booth.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Known simply as "The Hand," this famous public sculpture in Berlin was featured in a Depeche Mode music video.

Cold war icon and onetime "hole" in the iron curtain.

A fascinating insight into daily life in the Eastern Bloc.

This small glass cube is a peaceful out-of-the-way sanctuary at the busy airport.

Stolen goods adorn the organ at Old North Church.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

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

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

An obsolete, vanishing traffic device warns Cincinnati drivers away from middle-of-the-road obstructions.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.