Pennsylvania's own Roswell-style UFO mystery.

Priceless space junk on display in front of a local Dairy Queen.

The universally beloved children's television figure is interred on a high hilltop in one of western Pennsylvania's oldest cemeteries.

A museum commemorating the Donora Smog, which killed 20 people in October 1948 and sparked national outrage over air pollution.

This Pennsylvania cave holds evidence of the oldest known inhabitants of North America.

A quiet, gothic haven nestled between Pittsburgh's Squirrel Hill and Point Breeze neighborhoods.

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

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

Once the most painted on object in the world, this short campus fence is well on its way to being so again.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

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

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

There aren't too many operational funiculars around, but Pittsburgh has two!

This church in Pittsburgh is home to the largest collection of religious relics in North America.

One Pittsburgh musician's decades-in-the-making memorabilia collection is on display at this rock-n-roll curio shop.

It may appear to be a fancy junk yard, but each item has a story to tell and a lesson to impart.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

Rows of 19th-century brick ovens used to process coal into coke form the center of a wooded park.

This public space is speckled with the eerie remnants of a defunct amusement park.

This California artist's front yard acts as a gallery for his unique, scrap metal animal sculptures.