The largest self-built castle in the U.S., six decades in the making.

This rustic old building is said to be the most photographed barn in America.

A late-19th century diversion canal built by hand crosses Bryce Canyon National Park and is still in use.

This site is home to ancient petroglyphs and pictographs dating back to 6,000 B.C.

Walk through the sets of old western films at this small museum in Utah.

At this gas station in the middle of the desert, a convenience store has been carved directly into the rock.

Local lore holds that Butch Cassidy took an escape route through Red Canyon's sandstone hoodoos after an attempted murder.

This gallery of prehistoric red ochre art lines the wall of a scenic segment in Utah's San Rafael Swell.

A striking, menacing sandstone peak towering above a landscape that's equal parts Mordor and the Moon.

This quiet park's strange sedimentary spires were named after Kodak's color film.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

A tunnel with windows, so you don't miss out on the impressive views.

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

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

Here, at the “world’s longest art gallery,” you’ll find forty miles of ancient petroglyphs and pictographs.

This coastal rock formation resembles a churning cauldron at high tide.

On the Oregon coast is a natural hole that seems to be draining the sea.

Civil War-era Fort designed to withstand invasion and attack, with tricky traps called "murder holes."

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

This 19th-century ghost town offers a stunning view of Lake Michigan and a journey through the region's industrial past.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

A bizarre house filled with an astounding array of collections.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.