Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Site of a classic 19th-century physics experiment to prove the earth is rotating.

One of only two pod-shaped homes designed by Frank Lloyd Wright.

A monument celebrating the idea of reaching inaccessible places.

Stay in a room with a view... of the bottom of the ocean.

Archaeologists believe this panel of petroglyphs depicting descending sheep and other figures in Glen Canyon are 3,000 to 6,000 years old.

This small interfaith chapel lies not far from the rim of the Grand Canyon.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

The world's only teal arches exist in a city that cares more about its aesthetic than an Instagram influencer.

A geological mystery on Camelback Mountain.

Don't blink or you'll miss it.

A spiritual vortex among the red rocks in Sedona.

A self-built castle made by a mysterious man.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A sharp bend in a dramatic river canyon cut through red rocks.

See where Bill Murray kidnapped a hapless Punxsutawney Phil.

The oldest house in Galena, Illinois, now is a reminder of when this city was the world's lead mining capital.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

A wonderland of caves in eastern Iowa.

The farm toy capital of the world hosts a museum filled with toy tractors dating back to the late 1800s.

An underground wonderland in Iowa.

This long unused shot tower on the Mississippi remains a point of pride for a small city in Iowa.

The remains of a bustling turn-of-the-century park built to showcase the wonders of electricity.