This man-made mound monument was built out of soil from all across the Polish empire.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

An underground city of salt.

Every summer local children form "pysja patrols" to save young birds that have wandered from their nests.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

The largest oak in England is said to have been the hideout of Robin Hood and his Merry Men.

Follow the original medieval paths that wind through this intriguing section of the city.

A 6th-century stone lies at the site of the mythical battle waged between King Arthur and his nemesis Mordred.

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.

Famously misunderstood wonder of the ancient world

The oldest church in Iceland is one of the few to feature ornate decoration.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

This pub built its reputation pouring post-shift pints for employees of the cemetery with which it shares a wall.

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

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

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

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

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.