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

The only recreation of William Shakespeare's indoor playhouse.

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

The romance of early commercial flight still fills this Art Deco destination.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

This beautiful vintage movie palace has seen little change in form or function since the 1920s.

This sprawling museum holds one man's giant collection of real tanks.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

At 207 feet, one of the world's longest continuous escalators.

This statue is dedicated to Grace Sherwood, the last person in Virginia to be convicted of being a witch.

Take an otherworldly journey in a school dedicated to out-of-body experiences.

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

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

A little-visited ghost town state park offers a glimpse into Montana’s "Silver Queen."

This giant meditative chakra sits peacefully in the Flathead Valley of western Montana.

This amazingly preserved Gold Rush town is a historian's dream.