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

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A diorama of the Civil War, fought by cats.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

This strange, big-tailed beast became a Pennsylvania town's unofficial mascot.

A converted hangar displays dozens of helicopters, from a famous 1943 rescue chopper to several autogyros.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

A planned settlement in Pennsylvania once housed the aristocratic refugees of the French Revolution.

This dramatic rail curve was once the target of a failed Nazi attack.

Don't get it twisted: This is the oldest pretzel bakery in the United States.

This historic old movie house was the scene of one of the Blob's most iconic attacks.

A field of nothing but boulders which resembles a giant's gravel driveway.

A tradition unlike any other, this marks the site of the annual Groundhog's Day tradition.

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

A failed piece of Orientalism has become the proud symbol of a community.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

Yo, Adrian!

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

In which a local geological marvel becomes a quaint roadside attraction.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.