This hidden art nouveau gem was designed by an architect in search of a national style.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

Walk through a clothing store, across a courtyard, and up several flights of stairs for delicious coffee with a side of beautiful views.

You can row a boat through this ancient underground reservoir.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

A Hungarian pharmacy museum with a box full of mummy powder.

A mile-long navigable cave adorned with stalactites and stalagmites reaching up to 65 feet tall.

Bizarre dirt trail winds a narrow path above the tree line.

At the right time of day, sunlight floods through the roof of this cave and illuminates the small pavilion hidden within.

A memorial to the monk who set himself on fire to protest the persecution of Buddhists in Vietnam.

This Vietnamese bar doubles as a multistory labyrinth.

Vietnam's feral abandoned water park offers access to a post-apocalyptic funscape, now with fewer crocodiles.

The largest catacomb system in the world.

A naturally beautiful, seemingly bottomless deep blue spring.

A hidden stream deep in the mountains creates one of the largest tufa waterfalls in Serbia.

The ridged layers that make up this river canyon represent Earth's geological history.

The bizarre rocks of Đavolja Varoš are the result of natural erosion.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

For over 40 years, this quaint little house has teetered on a rock in the middle of a river.

A sinuous path among steep cliffs creates a stunning sight in southwestern Serbia.

Legends of treasure and spirits flow from this this fairy tale-like oasis.

This Romanian village may have been drowned, but it is long from forgotten.