Art historians have debated the identity of this medieval stone rider since the 19th century.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

The Cadillac Ranch for monster truck aficionados.

Its collection includes a broad array of social, geographic, graphic design, and political history.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Eighty million natural history specimens call this gargantuan museum home.

The only quarter of the Old City not dedicated to a major world religion.

As the Dead Sea continues to deplete, massive sinkholes open along its banks.

A "miracle" that seems to produce more holy fistfights than holy revelations.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

Purdue students would lean over this iron fence to skirt campus rules against smoking and courting.

Hot Doug's "Hot Dog" Stand.

What was once one of the country's largest confectionary plants is now an abandoned ruin, but is still pretty sweet.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

It was originally part of a "terrible lizards" collection at the 1964 New York World’s Fair.

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

This cheerfully-named branch of the Chicago River is the fetid result of years of blood, entrails, and meatpacking waste.

Not to be confused with the iconic New York City skyscraper, this Chicago building is a vibrant hub for artists.

An eccentric park and pool.

To find the "unicorns of the deep" you've got to go downstairs.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.