Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

This shallow pit was once used to send over 20,000 buffalo plummeting to their death.

This now-abandoned part of the original transcontinental railroad route provides a surreal driving and historical experience.

A desert settlement founded and later abandoned by Hawaiian members of the Church of Jesus Christ of Latter-day Saints in Utah's Skull Valley.

An attractive alpine lake at 8,400 feet that is accessible via a paved road.

This iconic 1958 tower welcomes air travelers to Tucson with neon-lit letters and architectural style.

A bizarre roadside attraction and the first instance of miniature golf in the world.

This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.

Tombstone of a dog that greeted passengers at the Southern Railway Depot.

A typical "Old South" manor, once owned by author Anne Rice, served as the setting for several of her witchcraft sagas.

Tucked away atop a quaint Alabama pharmacy is this tiny display of antique medical tools.