This Art Deco fortress in upstate New York gives Manhattan's vaunted examples of the style a run for their money.

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

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

The secret city built by the Manhattan Project.

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

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

This structure among the trees was the result of divine inspiration.

This former coal gasification plant found a curious second life as a popular public park.

This Seattle museum displays the history of the telephone through an impressive collection of telecom equipment.

The first park built over a freeway is a brutalist masterwork.

A (slightly) grownup take on the classic retro arcade.

This famous bridge twisted itself into oblivion, but not for the reason you might think.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

A 1940s nuclear reactor built to produce plutonium for the Manhattan Project.

A surreal landscape where fanged rocks rise from the ground and the ocean feels like a great mystery.

Quirky movable sculptures have been racing through the town since 1983.

The historic bar where local ship captains, traders, and gold miners would come together to do business a century ago.

A beautiful footbridge with over 2,000 glass sculptures along the walls and ceiling.

An electrifying collection of gadgets and literature from the 16th through 20th centuries.

The decorations were inspired by an unlikely missing treasure.

"The House That Love Built" is shying away from "The House That Ghosts Love."

A whimsical village of unique treehouses resides in a Washington forest.

This family mausoleum is steeped in symbolism and looks more like a fantasy location than a grave.

An extraordinary mixture of natural beauty and man-made phenomena.