The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

This natural marble cave is one of only five national monuments in Oregon.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

This small hill features the most notable collection of petroglyphs in Saguaro National Park.

America's only nuclear missile silo open to the public.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

This church on a Tohono O'Odham reservation has stood since 1797.

The remnants of an early automobile route across shifting sand dunes can still be found in the deserts of Southern California.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

This 19th century hydroelectric powerhouse was the first of its kind.

His discovery kicked off the Gold Rush. One of the hands on this commemorative statue points to the spot where he found the precious metal.

One of the oldest reform schools in the United States, home to wayward boys such as Merle Haggard, now abandoned.

Where the writer penned his famous story about a jumping frog.

Hidden beneath a lake for decades, this brutalist mine has now emerged from beneath the receding waters.

The longest covered bridge west of the Mississippi River.

A replica of the first public theater built in California.

Art Deco stylings conceal the true nature of this bridge.

An enchanting tunnel of cypress trees leads to an old morse code station still used today.

This abandoned boat was left in place thanks to its rotting beauty.

A poignant memorial to a young boy whose death spurred a dramatic increase in organ donations in Italy—dubbed the "Nicholas Effect."

The southernmost outpost of the Russian Empire in colonial America.

A trash dump made beautiful by nature's power.

This massive redwood tree has a hole in the base big enough to drive through.

A crumbling wizard is one of the final reminders of a roadside Middle Earth.