These ancient symbols freckling a Scottish cliff remained hidden for centuries.

These sacred Mesoamerican ruins feature peculiar petroglyphs hidden in the stones.

Tucked along a river are enigmatic stone carvings created thousands of years ago.

Some 2,000 carvings show this rare desert spring has been an oasis for travelers for over a thousand years.

A slab of sandstone covered with mysterious 1,000-year-old rock carvings from a vanished North American culture.

A scenic ravine with an astounding collection of rock art created by the Indigenous people of the Great Plains.

Mysterious ancient petroglyphs carved on a glacial boulder at the tip of Bainbridge Island.

More than 21,000 images fill this overlooked gem of a prehistoric site.

One of the American Southwest's most extensive collections of Navajo rock art.

A petroglyph map of the upper Snake River carved by prehistoric hunter-gatherers.

A working cattle ranch with remarkably well-preserved prehistoric petroglyphs and ancient ruins.

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

A cult archaeology conspiracy theory claims these West Virginia petroglyphs were written by Irish monks in Ogham.

The site of murders and Satanic cult gatherings.

“It's the quality” (but probably also the drive-through donut tunnel) that has attracted diners since 1968.

About 80% of all U.S. avocados are descendants of Rudolph Hass's glorious tree.

An unexpected and peaceful oasis on a hillside.

This graveyard is the eternal home of the residents of a vanished California town.

A shockingly detailed small scale recreation of the temples of Abu Simbel.

A museum dedicated to restoring vintage aircraft, located at a working airport.

This California tree is the single source of the state's entire orange industry.

Spend a day hanging out with domesticated Russian foxes.

Where there's quartz, there must be gold. Thus is the story of the mines of Julian, and the titillating times of the Gold Rush.

The world's largest wooden trestle stretches across this desert canyon in Anza-Borrego Desert State Park.