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

A giant time capsule not scheduled to be cored until 2040.

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

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

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

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

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

Built by the patriotic residents of Boonsboro in a single day.

One of the only memorials dedicated to journalists who died in combat.

Bizarre Cavern.

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

A monument marks the location of the first successful steamboat demonstration.

Try a classic Necco candy bar being resurrected in a small suburban shop.

You don't have to be a professional jockey to ride in Britain's oldest horse race.

After this former brothel closed, its interior remained almost frozen in time.

The Kalamazoo factory has 100 years of instrument-making, and one big wartime secret.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

Thousands of artifacts relating to human sexuality, including the world's largest sex bike.

This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.