This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

The tragedy of the Japanese internment camps is remembered here by a stark "Soul Consoling Tower."

This beloved roadside attraction welcomes visitors with his signature neon smile.

Singing sand that stands as the final remains of an ancient lake.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

Come for the speed, leave in love with the desert.

A 90-foot-tall psychedelic "tree" on the side of the highway has baffled passersby for decades.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

The fifth-longest natural arch in the world, and the longest outside China.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

For over a century, it has been a tradition to raise a flag at the top of this 450-foot sandstone pillar on the 4th of July.

A coal fire has been burning underground here since 1896.

Whimsical cartoon cars suspended on posts soar over an automotive shop.

Once at the center of U.S. finance, the historic Trading Room was meticulously recreated piece by piece and rebuilt in the Art Institute.

The third-oldest baseball stadium in the United States is in a league of its own.

Part of a worldwide art project, this mysterious semicircle of concrete shapes holds the pieces of a larger story.

This open air cathedral invites all faiths to worship under the only roof big enough to fit them all: the sky.

Symbolic attempt to overcome the issues of life.

All of Chicago's wood-paved streets are long gone but two alleys remain.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.