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

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

This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.

A dozen U.S. presidents have stayed at the historic resort, which was known as James Buchanan’s “Summer White House” from 1857-1861.

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

An occult-y, historic hotel with the World's Largest Ouija board on the roof.

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

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

Pennsylvania's own Roswell-style UFO mystery.

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

A larger-than-life statue of America's favorite sundae marks the place it was invented.

This museum is dedicated to the first coast-to-coast highway.

A beautiful oddities shop crammed with strange and morbid curiosities.

The national park was once a plantation estate.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

Where most of the world's flypaper was made.

The final resting place of the most famous sharpshooter.

A miniature world of concrete and stone in Springfield, Ohio.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

A headstone tells the sad story of a lost little boy and his pet dog.

Marvel at this turn-of-the-century masterpiece that has been turned into a rather stately supermarket.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.