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

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

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

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

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

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

The only recreation of William Shakespeare's indoor playhouse.