Ruins in Serbia

One of the most important fortresses along the Danube now lies in ruins.

This tower is all that remains from a medieval fortress.

This former monastery is still a revered religious site.

Ruins of an old water tower that look like a horror-film castle.

Once a beautiful palace, this structure is now known as the ''museum of destruction."

Once a bridge over the River Begej, now high and dry.

The ruins of a military-industrial complex now host concerts and more.

This outcropping was once home to a medieval monastery destroyed during the Ottoman conquest.

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

Despite being pillaged and destroyed a number over times down the centuries, this historic church still sort of stands.

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

A misnamed well, with a deep dark past.

Imperial palace of Emperor Galerius, the Emperor behind the worst Christian persecutions during the Roman Empire.

A Roman monument to their own civil engineering prowess.

Stone age urban planning.