The souvenir got the company’s founder out of a pretty pickle at the World’s Fair.

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

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

This abandoned dream castle and its cemetery look out over the city that once inspired their creation.

A labor of love built by local hang-gliding enthusiasts, this ideal launch spot was outlawed by the authorities and has since been largely abandoned.

The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

One of the oldest Catholic churches in the U.S., situated just east of Gettysburg.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

Despite its lavish ornamentation, and wholesome lifestyle of its devotees, this mountain commune has faced its share of issues.

The largest burial mound in the United States holds the remains of prehistoric West Virginians.

A bronze monument to Cleveland's favorite, fastest son.

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

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

This icon of the Atomic Age now lays dormant.

These disused steel furnaces are now haunting ruins that may one day be a national park.

The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

This plaque marks a place where one of Hollywood’s most famous dancers got his start.

This historic Pittsburgh tennis complex is a rare example of natural red clay courts.

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

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

Hundreds of antiquated typewriters and office machinery show the technological evolution of business.

This quiet, unassuming spot in Budapest was the birthplace of the bloody 1956 Hungarian Revolution.