The walls of America's oldest masonry fort famously "swallowed" cannonballs.

Nestled in an unassuming residential area, this "forbidden forest" is rumored to spirit away those who dare to enter.

148 feet long and in the middle of a verdant forest.

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

An ancient Phoenician citadel once stood at the site where Queen Dido first landed, according to legend.

Mysterious tombstones thought to be remnants of Atlantis.

This legendary city has been a tourist attraction for centuries.

A Bronze Age stone ship said to be the grave of the mythical founder of Gotland.

This Bronze Age man spent millennia buried in a mine, giving his bones an eerie hue.

This Bronze Age tomb is the centerpiece of a clearing within a beautiful Irish forest.

Legend says this little-known stone circle is formed from people petrified as punishment for dancing on the Sabbath.

Two 2,500-year-old Phoenician boats found on the coast of Spain, giving incredible insight into the ancient maritime traders.

The 3,600-year-old archeological sensation is considered to be the oldest representation of the cosmos.

Just another ancient, mysterious Irish stone circle.

This Bronze Age boat was found buried remarkably intact in an English gravel pit.

This 3,800-year-old site contains markers used to study the movement of the sun and moon and create a lunar calendar.

Celebrated as a center of civilization, the remains of the ancient city have been nearly destroyed by greed, egoism, and war.

The granddaddy of English geoglyphs dates back to the late Bronze Age.

An artsy hidden staircase leads to breathtaking views of San Francisco.

Across Ring Mountain is a vast collection of Native American petroglyphs unique to the region.

Fourteen curious and controversial white bunnies sit in a circle near Newport Beach City Hall.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

A rare pod of derelict midcentury Futuro and Venturo houses lines a semi-abandoned beachfront resort outside Taipei.

This New York estate was designed to resemble a medieval Scottish castle.