Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Stairs often replace streets on the steep slopes of this old mining town.

A living snapshot of a different time in America is preserved and maintained by a community of volunteers.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

The Magical World of George Phar Legler.

Limestone caves with spectacular showcase chambers.

A stone pillar marking the location of the westernmost battle of the American Civil War only honors one side of the conflict.

Dedicated to one of the darkest moments in Irish history, this memorial has faced its fair share of backlash.

The schoolhouse where Jesse Merwin, the inspiration for the "The Legend of Sleepy Hollow" character, once taught.

It's easy to see why this eclectic architectural wonder has been dubbed the "Spaceship House."

The ritual has been performed uninterrupted for nearly 700 years.

The 7,000-year-old calcium carbonate formation creates a magnificent natural bridge.

Small and slightly hidden, the American Writers Museum is preserving the legacy of America's finest authors.

In a quiet north Chicago neighborhood rests a stunning relic of the golden age of earthenware design.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

This bird-shaped rock formation defies gravity, time, and classification.

This sundial indicates the time based on where you stand within it.

A restored 114-year-old railroad station heralded as the most photographed depot in the United States.

Detroit’s downtown castle is one of the oldest structures in the city.

The world’s largest Masonic temple was saved by the White Stripes.