A huge musical instrument played by the ocean.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Olfactory delights in San Francisco's Botanical Gardens.

A famous alternative culture epicenter and where Joplin serenaded young hippies.

These figures float and flutter in this fountain crafted by famed Swedish sculptor Carl Milles.

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

This cannonball stands as a reminder of the final act of a fleeting governor amidst a revolution.

The taxidermy remains of the most popular pony in children's literature.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

Located at the former Lorton Prison the Lucy Burns Museum tells the story of the 91 year history of the prison including the dark chapter of its involvement in the women's suffrage movement.

This museum explores the grim reality of life in the earliest British colonies in America.

An innovative attempt to break a siege in the American Civil War still scars the earth today.

The rogue roots are gradually consuming some of the historic marble grave markers.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

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

One of the last active volcanoes on the Eastern seaboard.

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

The oddly shaped, steam-spewing building is now an art studio and gallery.

The skeletal white beams stand as a monument to religious dissent.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.