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.

A giant portrait of an ancient king looms over the river.

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 Bronze Age tomb is the centerpiece of a clearing within a beautiful Irish forest.

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.

This exhibit is one of the largest and most well-preserved collections of Jurassic-era trackways in the United States.

One North Dakota man's vast collection of rare rocks, polished orbs, and geological wonders.