An important pilgrimage site for pagans and early Christians, named for a Celtic goddess-turned-saint.

Just another ancient, mysterious Irish stone circle.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

This remarkable prehistoric town is full of watchtowers and houses that have withstood thousands of years.

The Stonehenge of Wales is one of the grandest neolithic dolmens still in existence.

This Neolithic stone circle is the most complete of its kind in Scotland.

This rocky outcrop served as a quarry for some of the bluestones that sit at the center of Stonehenge.

This Stonehenge-inspired solar calendar stands alongside a landfill, in the middle of the Nevada desert.

This famous Nevada gold mine, once a hotbed of Wild West shenanigans, is now open for tours.

A mining town once rife with murderous disputes over its copious treasures now creates income as a popular spot for photo shoots.

This hidden, women-built-and-operated Nevada temple on Shoshone Native American land is dedicated to the Egyptian lion goddess Sekhmet among other goddesses.

A futuristic-looking beach house built for the owner of a snack food brand.

An enigmatic natural rock formation with a manmade passage cut through the center.

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

These ancient sacred grounds granted amnesty to those who managed to reach them.

A model of a galactic embassy is hidden in plain sight along the highway, proposed by a UFO religion to find the aliens that created life on Earth.

This narrow coastline trail through the dense Kauai wilderness is among the most beautiful and dangerous in the world.

This ancient Hawaiian henge may have been an early star chart.

Hidden behind a YMCA stands the remains of a ceremonial site that dates back hundreds of years, whose ground is still considered sacred to many Hawaiians.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

An unexpected connection to Chicago awaits visitors on an island just off the California coast.

This serene oasis in an affluent Los Angeles neighborhood holds some of Gandhi's ashes and got Elvis into Eastern Philosophy.

The sun acts as a key that only fits this giant keyhole twice a year.

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