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

Turning night into day in Victorian-era Austin to thwart a serial killer.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.

The United States Capitol's former columns still stand.

America's post-nuclear-attack chambers of Congress.

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

The largest earthwork effigy in the world.

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

A world-class observatory in the California desert.

A geological mystery on Camelback Mountain.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.