An enclosed rotunda at the Henry Art Gallery in which viewers can look up and see the uninterrupted sky.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

Fourteen curious and controversial white bunnies sit in a circle near Newport Beach City Hall.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.

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

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

This little museum in the town where zombies were born celebrates the living dead.

America's only nuclear missile silo open to the public.

A unique sculpture park that specializes in the huge and bizarre.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

One of the largest, oldest, darkest, quietest motel rooms in the world.

One of the world's largest automobile junkyards is a unique landscape of metal and moss.

These towering spires and glowing walls are carefully crafted from hundreds of thousands of icicles.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

With the touch of a button, you can read a randomly selected short story.

Prehistoric animals decorate this popular outdoor park.

This painted blacktop brings the classic arcade game to life.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

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

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