At 207 feet, one of the world's longest continuous escalators.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

The site of the climactic scene from the classic horror film is now a historic landmark.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

The most decorated dog of World War I is preserved in the Smithsonian.

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

Exact replica of the ancient monument, but much, much lighter.

This structure among the trees was the result of divine inspiration.

Memorial built in 1922 in remembrance of WWI casualties.

Step inside Lucy, the world's largest "elephant."

Electrical pylon in the shape of Disney's beloved mouse.

A layered tribute to the work of mosaicist Isaiah Zagar.

The fastest transatlantic ocean liner sat abandoned in a Philadelphia shipyard for decades.

The first American department store, and home to the largest operating musical instrument in the world.

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

The world’s first penitentiary, meant to be humane, drove men insane.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

Mysterious rocks that ring musically when struck.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.