The abstract sandstone rock formations at this Algerian national park are rich with prehistoric art.

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

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

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

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

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

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This shop for all your super spy needs hides an educational secret.

David Sedaris called it "The greatest shop in the world."

A rambling museum which honors the beauty in everyday objects.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

The freshest fish here are the ones you catch yourself.

The former 1920s mansion of a prominent Catalan developer was used as the Soviet Embassy during the Spanish Civil War, and there is still a bunker below the garden.

An architect transformed this abandoned cement factory into his castle-like workshop.