The corporeal remains of Napoleon III's dentist rest under this 15-story obelisk.

The body of St. John Neumann and his collection of hundreds of relics, on display in a Philly church.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

One of Philadelphia's largest murals resides hidden under this bridge.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

One of the oldest of its kind.

The oldest active church in Pennsylvania is also the second oldest Swedish Church in the United States.

A completely round house designed for the Atomic Age.

The final resting place of one of the United States's greatest poets.

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

An unusual assortment of steerable wooden sleds is on display in a library in New Jersey where they were first invented.

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

South Philadelphia is home to Keith Haring's only surviving in situ collaborative public mural.

A layered tribute to the work of mosaicist Isaiah Zagar.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

A daily replay of the experiment that proved the rotation of the Earth.

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.

This forgotten building was one of the few Philadelphia-area breweries to survive Prohibition.

Old neon signs from the City of Brotherly Love provide a snapshot of the city’s evolution.

The first American axe throwing club.

Enjoy a slice while browsing the world's largest collection of pizza memorabilia.

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

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

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