The first burial place of the Harmonist Society, a utopian community for which the surrounding town of Harmony is named.

A hidden pet cemetery honors the generations of canine companions from one of Pittsburgh's most famous estates.

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

This restored log building was one of the first toll booths for travelers along the Northern Turnpike.

A pyramid commemorates the birthplace of James Buchanan, the 15th president of the United States

This recreation of a 19th-century dime museum is full of oddities.

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

This is the spot where the bloodiest battle in the American Civil War may have started.

Built in the 1970s, this curious modular home found new life as a sundae-shaped ice cream stand.

A 20-foot-tall quarter commemorates George Washington’s ties to Bedford County.

This former fire tower found new life as a communications hub complete with a scenic overlook.

One of the "twins" in these falls on the Snake River was sacrificed for hydropower generation in the 1930s.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

Where the famed daredevil attempted to launch himself across a canyon in a custom-built rocket.

The only bridge in the United States where BASE jumping is legal without a permit year-round.

A former sanitarium where soldiers were sent to recover in the healing waters of hot springs.

Home to the deepest rift anywhere on Earth.

Boise State's stadium was the first non-green football field in the world.

The actor best known for slapstick comedy is memorialized in his home town.

This university transit system is a 1970s vision of the future.

Featuring the largest CinemaScope screen in Pennsylvania, this drive-in has entertained moviegoers for more than half a century.

The first American department store, and home to the largest operating musical instrument in the world.

The Lincoln Memorial has inspired many, even though a word on the inscription appears to be spelled incorrectly.

The site of a tragic massacre that spawned a multimedia franchise.