Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

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

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

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

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

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

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.

Huge masonic hall in Philadelphia with lavishly themed rooms.

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

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

A rare view of a preserved Victorian science museum.

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

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.

A unique set of caves that spits waves back out into the ocean.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

A Hawaiian stairway to heaven—that you can't climb.

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.

The air force base preserves its scars from the Japanese attack on Pearl Harbor.

This World War II-era bunker is now packed with posters and props from movies and TV shows filmed nearby.

Race through the maze, get your name on the sign.

The sprawling, eccentric estate of Ames and Ames, a brilliant botanist, and a genius inventor and artist.

This century-old cinema house has a marquee that has been hand painted by a single man for over 25 years.