Old neon signs from the City of Brotherly Love provide a snapshot of the city’s evolution.

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

The body of St. John Neumann and his collection of hundreds of relics, on display in a Philly church.

A museum dedicated to the strange and extravagant costumes and memorabilia of the mummers, a tradition older than Philadelphia itself.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

Quite simply the largest tree in the world (by volume).

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The world's longest known cave system.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

A beautiful geyser under environmental threat.

The first declared National Monument in the United States.

The fairy tale castle of the "fairy-tale king."

The final resting place of New Orleans' most famous voodoo priestess.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

An emerald-green grotto just a short trip from Austin.

This landmark cemetery in Boston was created more than 300 years ago.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.