This unassuming North Austin neighborhood was built to test the novel idea of home air conditioning.

A high-octane shrine to the greatest Texans who ever lived.

This massive oak tree has ties to the first native tribes of the region and the founders of Texas.

Locals dubbed it the "Owl Building" because of its bird-like appearance.

A grove of colossal man-made flowers built to collect the sun's rays.

When Motown musicians came to Nashville in the 1960s they stayed at this historic record-pressing company because hotels wouldn't host them.

A cannonball from Union forces battling John Hunt Morgan made this church a permanent home.

This stone memorial pays tribute to a massive shipwreck which was sadly overshadowed by the death of John Wilkes Booth.

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

A bronze sculpture honors the 12 black students who attended the first integrated public high school in the segregated South.

This hotel was used during the Manhattan Project to house official visitors.

John Hendrix predicted the creation of the "Secret City" built as part of the Manhattan Project.

The secret city built by the Manhattan Project.

One of the Cemestos prefab homes built to secretly house thousands of Manhattan Project workers.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

Enormous lake at the bottom of a unique cave system.

The perfectly named cave drop is the deepest in the continental United States, almost matching the height of Seattle’s Space Needle.

One person's lost luggage is another person's treasure.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

This historic train station has been converted to a locomotive themed hotel.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

The scant remains of this flooded historic village can be explored in one of the most remote areas of the Great Smokies.

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

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