A big museum full of little worlds.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

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

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

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

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

A layered tribute to the work of mosaicist Isaiah Zagar.

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

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

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

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

Yo, Adrian!

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

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

This Philly landmark has a giant butterfly pavilion, three floors of insect displays, and withstood a $40,000 heist.

Hidden behind West Philadelphia rowhomes is a haven for migratory and local bird species both ordinary and rare.

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

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

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

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

An Irish Memorial commemorating those who perished due to potato blight.

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

An absolutely beautiful 200-foot stained glass installation traces the evolution of knowledge.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.