This historic national park is covered in the stunning ruins of red rock pueblos.

An artificial crater field that trained astronauts for lunar exploration.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

Ancient pueblos built into the base of a natural canyon wall.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

Thanks to an acoustic anomaly, this unassuming stone bench has heard one hundred years of secrets.

The world’s first hotel to be run by robots.

This elegant arc of a waterfall marks a religious turning point.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

A charmingly eccentric magma chaser presents his complete history of the island's eruptions since 1947, in cinematic form, just for you.

This ancient rock painting is the oldest evidence of humans’ love affair with honey.

Fans of the spicy bright-red sauce can tour where it's made.

A psychedelic labyrinth on the San Francisco bay.

This weekly market in the remote oasis city of Hotan still has the atmosphere of the old Silk Road.

Hundreds of mossy stones engraved with bits of philosophy, literature and random musings.

One of the last free public hot springs is decorated with hippie art.

The tragedy of the Japanese internment camps is remembered here by a stark "Soul Consoling Tower."

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

This impressive tunnel was dug entirely by hand over the course of 36 years.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

This beautiful, historic church looks like something out of a simpler past.

This hobbit-y little hot spring may be the oldest spring used by humans in all of Iceland.