The most visited, and possibly most controversial, museum in Germany.

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

The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

According to legend, this boat-shaped henge is built over the grave of a mythic king.

An abandoned faux-pub made famous by a Guinness commercial.

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

Petrified footprints of one of the very first vertebrates to walk on land.

A hugely vast Irish landscape of barren rock that stretches for miles.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

Huge standing stones mark a site of megalithic mystery.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

A sacred well steeped in Pagan roots on the West Coast of Ireland.

A corkscrew-shaped barn in Ireland.

Obelisks and stone pineapples in the Irish countryside.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

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

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.