One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

According to legend, this rock represents a young girl trapped by an evil ocean spirit.

This alley-cum-fan gallery in the ex-Nirvana drummer's hometown holds the world's largest drumsticks.

A touching tribute to a local hero who made sure his neighborhood stayed clean.

A wall of chewing gum moonlights as collective art.

This large Sitka spruce that appears to be floating in mid-air, has defied logic for years.

Stroll through a wonderland of stupendous moss-covered trees.

This mountaintop beacon is only lit three times a year but shines like some kind of all-seeing eye.

A vaudeville performer mounted this hollowed-out redwood log onto the chassis of a truck, and toured the country spreading a message of conservation.

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

This nature mural exists to protect the surrounding environment and its own canvas from destruction.

A total of 14 men held the title of "president" before George Washington—their historical legacies are enshrined in the lobby of a hotel.

This statue honors the author's groundbreaking family story.

In 1787, a group of delegates met at this very spot to drink, be merry, and ratify the Constitution of the United States.

The Dover International Speedway is home to a towering, concrete-skinned, racecar-hungry behemoth.

When oil was discovered just outside of Pittsburgh, the city became home to this regional stock market.

Visitors to Salt Springs State Park are encouraged to literally put their two cents in Penny Rock.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

A planned settlement in Pennsylvania once housed the aristocratic refugees of the French Revolution.

This jail which was in service for over a century is now open for curious visitors.

An Olympic hero stripped of his medals is buried in a town he never visited, which took his name after his death.

The famous bell was secreted away and hidden in a church in Allentown during the British occupation of Philadelphia.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.