The Grand Canyon of Texas.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

In one of America’s oldest mountain ranges, a long-awaited section of a scenic highway is now open to the public.

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

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

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

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

This replica stave church looks like a piece of Norway was simply plopped down in South Dakota.

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.

One of America’s oldest and spookiest hotels, thanks to the residency of ghosts, dead presidents, and Alfred Hitchcock.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

This psychedelic tromp l'oeil seems to be beckoning drivers to crash into a wall.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

One of the best places to see feral Colonial Spanish Mustangs in the United States.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A tree bears footwear on the loneliest road in America.

The arch that celebrated the completion of the Lincoln and Victory highways.

A former mining hospital is now a vibrant artistic hub.

Curiously, this large sporting goods store features 14 wax representations of American presidents.

Historic home to one of the most famous women pioneers of the 19th century.

Back in the day everyone who was anyone played this historic western theater.

This historic estate on the east shore of Lake Tahoe was home to an eccentric millionaire (and his pet elephant, Mingo).