This tiny structure was built by the creator of the Brooklyn Bridge.

The first partially complete dinosaur skeleton was discovered here, forever changing the world's view of the ruling reptiles.

World's first "penitentiary," meant to be humane, drove men insane.

The oldest surviving presidential residence in the United States.

An eccentric priest's tribute to George Washington, this chapel tells the story of the American Revolution.

Descendants of this colonial Pennsylvania family still travel from far and wide to visit the 300-year-old home of their Quaker ancestors.

A memorial to the 1913 tragedy that helped protect the workers of the future.

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

A rare view of a preserved Victorian science museum.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

This elaborate towering structure was once famed for its revolutionary height.

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

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

Century-old shop, specializing in Occult products.

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

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

America's first serial killer rests in anonymity.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

A simple plaque remembers an act of WWI terrorism that obliterated an island and forever scarred the Statue of Liberty.

One of only two commuter aerial tramways in the United States.

Storage warehouse of the rich and famous.

This lavish room at NYC's French Embassy is a rare relic from the end of the Gilded Age.