Natural sonic phenomenon comes with a grisly legend of murder and blood.

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

In this subterranean brick arcade, a small shop continues the ancient practice of bookbinding.

A building made mostly of cast iron features a 1:45 scale lego model of its self.

This sound-art installation features songs composed using only the Mid-Hudson Bridge as an instrument.

This overlooked courtyard and museum celebrate Benjamin Franklin's life and achievements.

Welcome to the home of the world's largest typewriter company.

The corporeal remains of Napoleon III's dentist rest under this 15-story obelisk.

A tragic mystery left this boy nameless for 65 years.

America’s smallest national park site is the former residence of exiled Polish national hero Thaddeus Kosciuszko.

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

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

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

This beloved marketplace mascot poops money and grants good luck.

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

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

Yo, Adrian!

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

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 one of the largest glass murals in the US.

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

Walk down an otherwise nondescript alley near Washington Square West in South Philly and find yourself in a vivid, immersive mosaic wonderland.

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

Trace the history of the nation’s early days at the site of America’s oldest stock exchange.