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

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

Those belting out show tunes might not realize this piano bar marks the site where Thomas Paine died in 1809.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The oldest farmer's market in America is so ancient it was approved by the King of England.

The world's longest known cave system.

An unusual, super-sized grocery adventure awaits in an Ohio suburb.

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

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

This beloved marketplace mascot poops money and grants good luck.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

The first American axe throwing club.

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

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

A once-glowing grotto at the bottom of Waikapalae Wet Cave.

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

A tunnel of hardened lava along Maui’s famous Road to Hana.

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

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

Doris Duke's lasting collection of Islamic Art, hidden in a Hawaiian paradise.

A controversial memorial at the place where Captain Cook met his violent end.

This black shoreline is made up of exploded lava particles.

The spot where the namesake of the Douglas fir met his mysterious end on a Hawaiian volcano.