The largest stone circle in the world has ended up bringing up more questions than it has answered.

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

A six-ton wedding present for the King of the Scots.

The final resting place of soldiers' loyal canine companions.

The fountain marks the area where hundreds of accused witches were burned at the stake.

360° views of the city plus five floors of optical illusions and hands-on science.

A sweet symbol marks the place where torturous executions were once carried out.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Huge winged monument in the United Kingdom.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

Northern Ireland's Brobdingnagian stepping stones.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

The atmospheric road was never meant to be so creepy.

The ancient tomb acts as a calendar that keeps perfect time.

An ancient neolithic tomb that only sees the sun twice a year.

This small Irish village suffered the greatest loss of life when the Titanic sank.

A giant "X" symbolizes the blood spilled from the brutal Juárez drug wars.

Buried beneath the New Mexico sands are believed to be millions of copies of Atari's E.T. video game.

Town not known for anything except its strange name.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

This downtown Dallas art installation is always on the lookout.

The second largest roadrunner in the world stands 11 feet tall in his West Texas town.

A grove of colossal man-made flowers built to collect the sun's rays.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.