San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

An artsy hidden staircase leads to breathtaking views of San Francisco.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

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.

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

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

Yo, Adrian!

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

Huge masonic hall in Philadelphia with lavishly themed rooms.

The oldest surviving botanic garden in the United States.

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

Where America’s first doomsday cult awaited the end of the world.

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

Once a bustling cotton factory, this early 20th-century building is now home to a thriving artspace.

This enormous monument is one of the most iconic structures in Tokyo, rudely nicknamed "The Golden Turd."

A 20-meter (65-foot) robot towers over Tokyo Bay.

Tokyo’s only Vaudeville-cuckoo clock–steampunk-Victorian curio cabinet time piece.

Nordic giants resurrected from the sea and restored to their former greatness.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.