One of the world’s largest collections of paper memorabilia chronicles 4,000 years of papermaking.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

Bad farming practices caused this unnatural natural wonder.

This bar hosts an ever-evolving napkin art installation devoted to an American president.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

America's only nuclear missile silo open to the public.

This erect, phallic geological spire wasn't always named so domestically.

An experimental, automotive replica of Stonehenge.

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

Outsider art meets paleontology at this roadside reptile repository.

"Not too many people can say they've had a nuclear bomb dropped on them, not too many would want to." — Walter Gregg.

Two flush headstones mark the only known graves to be embedded in an airport runway.

Despite being burnt down multiple times, the ruins of this South Carolina church are still standing.

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

This intricate Hindu temple is the largest of its kind outside of India itself and was constructed like a giant puzzle.

A vision of beautiful Hindu architecture in the middle of the American South.

The largest cemetery in the American Southeast is a hidden gem near the heart of Atlanta.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

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

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

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

A bunker "with enough U.S. currency to replenish the cash supply east of the Mississippi" in the event of nuclear war now protects nitrate film.

This maze-like slot canyon is a unique gem within an already fascinating geological area.