Three bridges and one giant canyon make up this fantastic Spanish settlement.

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

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

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

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

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

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

This North Carolina museum is keeping the pinball craze alive, with a little Space Invaders on the side.

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

The secret city built by the Manhattan Project.