This suburban house is made of dirt, and almost sparked a revolution in home construction.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

The ruins of this long-abandoned unsuccessful gold mine can still be found.

This ruined quarry once produced the distinctive red sandstone used for construction projects in Washington, D.C.

The oldest surviving one-room schoolhouse in Montgomery County, Maryland.

Using a massive antenna made up of five miles of wire, two scientists tuned into organic radio waves from the planet Jupiter.

Conveniently located within binocular range of a nuclear bunker, the "summer camp" area was a painfully obvious spy house.

This sweet Southern elixir comes from what may be the oldest grape vine in North America.

This abandoned lighthouse looks like a rusting oil rig, but has managed to survive a number of storms.

From failed port town to Civil War fort, the ruins of this former defense saw their finest day in the television age.

This centuries-old graveyard is the final resting place of the Fort Fisher Hermit.

The only pachinko parlor in the United States.

Mile-long cave system near Great Smoky Mountains.

Mysterious ancient boulder carved with petroglyphs in the mountains of Western North Carolina.

An abandoned town is hidden in Great Smoky Mountains National Park.

Over 20,000 sets of spice shakers reveal the surprisingly telling history of our most basic spices.

This vast kitty-themed collection illustrates the history of human-cat interaction.

Step back in time on this preserved 1800s farm.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

Time travel with sweets across history at this research-based candy store.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

One of the last active volcanoes on the Eastern seaboard.

Herbert Hoover's "Brown House" rural presidential retreat was a PR disaster amid the start of the Great Depression.

This shale formation along the Appalachian Trail once inspired the third president of the United States.