The first permanent memorial to a unique secret weapon of World War II.

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

Come for the pizza, stay for a performance on the world's largest theater pipe organ.

The unusual burial monument of Arizona's first governor.

A mysterious "wedding cake" castle in the middle of the urban desert.

A towering bronze statue memorializes the founding father of postwar American conservatism.

A geological mystery on Camelback Mountain.

This tiny home was originally a narrow alleyway.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

A downtown park built on top of unclaimed graves.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

An inconspicuous footbridge beloved by San Diego locals.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This giant bronze image of Christopher Columbus embarked on a voyage of its own.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

Faceless white figures loom over the city from the rooftop.

The second building of its name to occupy this location might be the finest flatiron building in San Francisco.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

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

A hidden garden of stones engraved with scriptures, a Joseph Smith Sphinx, all carved by one man.

Oddly shaped rock formation, misassociated with a nearby utopian community.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.