Northern Ireland's Brobdingnagian stepping stones.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

An unusual round church in London with a Templar past.

Famously misunderstood wonder of the ancient world

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

A kaleidoscopic warehouse-maze of handmade neon signs.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

This World War II relic let Allied pilots know they were entering neutral airspace.

The ruins of a medieval monastery named after a type of tree.

A proud bronze billy stands as an eternal symbol of Ireland's oldest festival, where a goat is made king.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

Just another ancient, mysterious Irish stone circle.

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

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

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Over a dozen Native American earth mounds dating back over 2,000 years dot this Tennessee archaeological park.

Elvis's own personal tropical hideaway.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

This shop for all your super spy needs hides an educational secret.

Memorial of the Salem witchcraft hysteria in the town of Danvers, where it all began.