For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

These medicine cabinet staples are part of the museum's collection of everyday objects.

The first American axe throwing club.

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

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

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

A layered tribute to the work of mosaicist Isaiah Zagar.

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

This public park was the site of the largest civilian disaster of the Civil War.

This secluded walking trail is a hidden gem of a Pittsburgh park.

The last street in Pittsburgh that's paved with wood.

An 18th-century Catholic church converted into an eccentric temple of music and bacchanalia.

Mutant vegetables, transgenic mosquitos, and atomic rodents span the walls of this one-of-a-kind museum.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

House of vintage taxidermy and Steampunk sculptures in a quiet Pittsburgh neighborhood.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

A beautiful oddities shop crammed with strange and morbid curiosities.

The dance of this huge clock is a magnificent and eerie commentary on good and evil in the history of humankind.

This alley off Edinburgh's Royal Mile contains remnants of the city's seedier history.

Come for the oysters, stay for the priceless art honoring inventors across history and Scotland's favorite outdoor sports.

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

An American ghost town hides along a side street in Scotland's capital.

This historic pub has maintained much of its 1906 decor, including a small sequestered room for women, where orders were slipped through a tiny window.

Nestled amid the peaks and lochs of the Scottish Highlands, this inn and pub has played host to outlaws and ghosts.