The world's longest known cave system.

A gas station and a state sign commemorating the most famous claims of extraterrestrial abduction.

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 general store is more than a century old and home to various oddities and antiques.

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

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

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

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

This Maryland farm is known for its amazing corn mazes and its 30-foot junkbots.

Remnants of a storybook amusement park hidden behind a strip mall.

According to local history, this cast-iron canine was nearly melted down for bullets during the Civil War.

This building at the south end of the boardwalk was once home to the U.S. Life-Saving Service and the U.S. Coast Guard before being rescued itself.

First built around 1848, this bridge was destroyed by arson, but original timbers are included in the replacement.

The smallest covered bridge in Maryland.

Washed out by the Johnstown Flood in 1889, the surviving portion of the original two-span bridge now resides at Fishing Creek.

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

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

The world's oldest continuously operating airport was founded by the Wright Brothers.

Easter in Westminster may be the only time and place to behold Edgar Allen Poe made entirely of Marshmallow Peeps.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.