This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

One of the newest mosques in a city filled with thousands.

A tiny park in the middle of some big power politics.

It's believed that this small church was connected to the Hagia Sophia via a secret tunnel.

This shuttered power plant is now Turkey's first industrial archaeology museum.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

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

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

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

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

This spaceship-like Serbian monument reaches for the stars in celebration of the fallen fighters of fascism.