A Jenga-style cylindrical tower of books that appears to go on forever.

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

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

A museum dedicated to the former country.

This ice cream parlor serves scoops of flavors like rakia, medlar, and poppy seed.

Different sections of the Zemun Fortress were built in the 14th and 15th century as a response to the advance of the Ottoman Empire.

A collection of intricate sculptures so small they have to be seen through a microscope.

Some of the greatest minds in the history of Hungarian art and science converged in this café.

This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

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

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

Once the home of a hermetic monk, this cave now houses a small church.

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

The true meaning behind this sculpture remains unknown.