1. Monument to the Revolution of the people of Moslavina
This one and many other Brutalist structures were commissioned by former Yugoslavian president Josip Broz Tito in the 1960s and 70s to commemorate sites where WWII battles took place. They embody everything brutalist architecture is about and while their reason for being is a sad one they are also beautiful in a defiant way.
2. The Research Institute for Experimental Medicine
It might look like a warship, but this building is a medical research lab. It definitely fits in with the fortress-like style.