The 20-mile causeway that separates the Netherlands from the sea.

A small marionette collection located within the dark cellars of an 11th-century Austrian castle.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

An industrial site turned into Hungary's most cherished natural wonder.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

The romantic garden was the epicenter of the Hungarian art scene in the 1880s.

The world’s first statue of the late Apple co-founder.

A Hungarian optometrist's charming collection of Asian art and curiosities.

A tribute to the builder(s) of Bitcoin.

A forgotten graveyard lost in the tangles of an overgrown garden.

A 13th-century convent where St. Margaret of Hungary spent her teenage years.

Everything from miniature biblical scenes to life-sized statues are almond-based at this sweet and nutty gallery.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

Climb around the high waterfalls on series of iron ladders and bridges within the wildest gorge in the Slovak Paradise.

An unusual cave filled with rare alien-looking aragonite formations.

The only natural cave bath in all of Europe.

The ruins of a 13th-century monastery that long served as a place of refuge from wars and raids.

This picturesque castle in Poland has a rich history, including a legend that ties it to lost Incan treasures.

An abandoned 19th-century iron factory perched along the outskirts of an idyllic village.

Dedicated to this region's early settlements and rich history of salt mining.

A gorgeous stone viaduct crosses over a bucolic valley.