The Ryerss mansion in Burholme Park now houses a community library and a museum filled with a trove of oddities from around the world.

The singer, actor, and activist lived here during his final years, and now it’s a museum dedicated to his legacy.

The humble field where the first Major League Baseball game was played.

The oldest surviving presidential residence in the United States.

Alexander Hamilton’s creation caused quite a bit of controversy.

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

Step into a pastel time capsule where candy is truly dandy.

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

In the early 1800s, surgery was also a show.

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

Dr Barnes' $25 billion private collection of art and arboretum.

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

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

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

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

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

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

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

This small monument to the great inventor contains a time capsule and a Wi-Fi hotspot.

George Lucas donated this park to honor the birthplace of his two biggest movie franchises.

A rough granite monument marks the spot where Europeans first caught sight of the San Francisco Bay.

A master of deception, Harry Houdini's greatest trick may have been living in two places at once.

A statue commemorate Tommie Smith and John Carlos's brave protest at the 1968 Olympics, a watershed moment for civil rights.