Nibble as you learn about Slovenia's longstanding tradition of making beautiful honey cookies.

This was the second largest mercury mine in the world and one of the oldest preserved mine complexes in Europe.

This massive subterranean fissure is known as the "underground Grand Canyon."

One of the largest caves in the world open to the public.

The "Prussian Versailles" that is as glorious today as when it was built.

The world's only flying boat museum honors a small Irish village that sent 20th-century aviation to new heights.

One of Hungary's most influential places of learning is also home to one of the world's most beautiful libraries.

After sitting unused for decades, this abandoned communist infrastructure became a wildlife utopia.

One of the few cold geysers in Europe, its eruptions are powered by carbon dioxide.

A beautiful display of nearly 50 bells crafted with a unique design and distinct sound.

This rare and ancient Christian relic is one of Ireland’s oldest freestanding stone crosses.

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

A standing relief of a Norman knight whose posture marks him as a Crusader.

Huge standing stones mark a site of megalithic mystery.

These imposing walls and towers look more like the ruins of a fortress than a monastery.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

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

A corkscrew-shaped barn in Ireland.

This ancient Irish landscape boasts hundreds of legendary ruins.

This amazing collection includes rare stamps from around the world, including fluorescent ones.

The British monarchy's stamp collection is one of the most impressive in all of Europe revealing generations of royal nerdery.

The spectacular subterranean collection includes dazzling minerals, including a piece of "kryptonite."

A natural history wunderkammer in the middle of the desert.

The museum houses "the most studied meteorite in history," among other geological oddities.