This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

A spiritual vortex among the red rocks in Sedona.

The world's only teal arches exist in a city that cares more about its aesthetic than an Instagram influencer.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

Time travel with sweets across history at this research-based candy store.

Built in the 1850s, this church was of the first five churches constructed in Harper's Ferry.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

This historic old movie house was the scene of one of the Blob's most iconic attacks.

Less a museum than a bizarre fantasy world created by artists and engineers.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

An abandoned stretch of highway, deteriorating next to the operational one.

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

This giant, rotating globe was built to celebrate the expansion of a company that makes steam cleaners and pressure washers.

In the parking lot of a fast food restaurant, a statue memorializing a prolific bull elephant.

Pennsylvania's own Roswell-style UFO mystery.

The tragic reality of a village riddled with rumors of haunts, chemical spills, and serial killers.

Beside a busy highway, a colony of Great Blue Herons raises hundreds of offspring each year.

A monument to the “unrecognized dead” of the tragic 1876 train crash.