One of Bristol's best-hidden gems has ties to Lord Byron, whence it became the nation's first reformatory school for girls.

17th-century merchants in Bristol nailed their deals by placing money on these pedestals.

The Bristol Camera Obscura housed in an ancient windmill.

The abandoned funicular tunnel was a secret base for the BBC during World War II.

Massive mounds of golden sand look like a desert landscape randomly plopped in an Arctic forest.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

This set of mysterious petroglyphs in the Peruvian jungle could shed light on centuries-old activities in the region.

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

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

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

Colorado's only true geyser is hidden within the San Juan National Forest.

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

Legends surround this jagged rock formation in the New Mexico desert.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

These aggressively sustainable art homes look like something out of 1970's science fiction.

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

A unique geological area spiked with wind-carved rocks that resemble teepees.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

Natural sonic phenomenon comes with a grisly legend of murder and blood.

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

A couple turned their front yard into an artistic masterpiece.

This little blue house pokes out over the campus of UC San Diego, seven stories high.