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.

Honoring the famed folktale author, this California museum looks like it belongs in the Black Forest.

With its peeling paint and faded sign, this theater-turned-recycling plant is a nostalgic relic of 1950s Americana.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

When ecosystems collide in the arid Southwest.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

This grand stone tower was dedicated to a famed American humorist almost by coincidence.

This super steep hike ascends 2,000 feet in less than a mile.

Home to more than 13,000 pieces of war memorabilia and military equipment.

While most of the games in this arcade take quarters, that would have been a small fortune when they were made.

The largest source of fossilized insects anywhere.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

There are eight natural springs around town, each with a slightly different taste.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

An incredible little museum of interior design full of artifacts collected from around the world.

The conquistador's former fortress is the oldest preserved colonial building in the Americas.

This Oaxacan town is known for its colorful fantastical creatures hand-carved by local artisans.

These sacred Mesoamerican ruins feature peculiar petroglyphs hidden in the stones.

The ruins of an ancient pyramid built by the mysterious Chupícuaro civilization.

The unique collection often goes unnoticed by visitors focused only on the archaeological objects.

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

The ruins of an ancient city built by Mayan traders is centered around a temple of a sacred feathered serpent deity.

The stoutest tree in the world.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.