An off-the-beaten-path place to literally hang beneath Milwaukee's Holton Street Bridge.

One of the largest Buddhist stupas in North America is built of concrete designed to last 1,000 years.

Bonsai garden in Oakland is curated by the first non-Japanese female bonsai master in the United States.

The king of U.S. high points towers over every other peak on the continent.

The ruins of this long-abandoned unsuccessful gold mine can still be found.

A community of collapsing homes more than a mile out from the Florida coast.

These elevated trucks were put in place as a middle finger to The Man, but are now considered folk art.

From Japan to Italy, this California park explores the world's cultures through their gardens.

The overgrown remains of an old rail bridge rise above the valley like ancient Greek ruins.

This symbol of peace is appropriately positioned overlooking the Pacific Ocean.

This rare basilica nestled right in downtown Asheville is an architectural marvel, inside and out.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

This ghost town was once a cult-like religious utopian settlement.

This surprising gem is a world-class archeological museum hidden at the University of Chicago.

It's a pretty creepy lock-up.

A perfect circle of 24 mysterious holes dates back to prehistoric times.

An urban laboratory.

This former maximum-security prison is creepy, sobering, and supposedly haunted.

The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.

Check out the underground party scene at the "Burning Man of Brooklyn."

A mining town once rife with murderous disputes over its copious treasures now creates income as a popular spot for photo shoots.

The stone labyrinth in this New Orleans city park was laid to symbolize healing in the wake of Hurricane Katrina.

Outstanding collection of 19th century medical instruments includes a life-size figure cast from as many as 200 cadavers.

America's post-nuclear-attack chambers of Congress.