Medicinal spa created from the mineral-rich runoff of a geothermal power plant

A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

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

A glimpse into the lives of the the Miwok and Paiute people in Yosemite National Park.

The interior of the Overlook Hotel in "The Shining" was based on this Yosemite original.

A giant donut stands as a popular symbol of Los Angeles iconography.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

What was once the world's second largest slate quarry is now a surreal post-industrial landscape

An impromptu shrine appeared shortly after beloved "Torchwood" character Ianto Jones was killed off the show.

The castle still holds traces of the abandoned Roman fort it was built atop.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

A dazzling display of red rocks weathered into spires and hoodoos.

The location where the iconic movie character declared it was time to go home.