Former villa and estate of James Deering developed to preserve native tropical forests.

This beautiful Miami garden was designed as a laboratory for tropical plants.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

Outsider art meets paleontology at this roadside reptile repository.

This sprawling farm was once a Cold War-era hideaway for the nation's top diplomats.

These buildings are a poignant reminder of the thousands of horses and mules who passed through this area of the Shenandoah Valley on their way to war.

On the side of a Virginia highway, a collection of monuments commemorates an 18th-century trek through the Blue Ridge Mountains.

An enormous warehouse filled with parade floats collected from over 50 years of patriotic celebrations.

Herbert Hoover's "Brown House" rural presidential retreat was a PR disaster amid the start of the Great Depression.

Exact replica of the ancient monument, but much, much lighter.

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 mansion was built as a symbol of love between a husband and wife.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

An abandoned textile mill that is now home to art and concerts.

Outdoor exhibits explore the contributions of European, African, and indigenous peoples to American frontier culture.

The only recreation of William Shakespeare's indoor playhouse.

Near-constant high winds deform the trees on Spruce Knob, the highest point in West Virginia.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

Developed by focused shutterbugs, this museum exposes visitors to more than 6,000 different cameras.

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

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

One of the last active volcanoes on the Eastern seaboard.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.