These architectural structures have always intrigued me, imposing, space-age, futuristic.. During the 60s and 70s in former Yugoslavia previous dictator Tito commissioned them to be built as memorials of the Second World War. Twenty years ago there were thousands of them many of which were destroyed in the 1990s. The ones that remain were either too large to knock down or too remote. Photographer Jan Kempenaers has travelled around the Balkans documenting them. These structures are incredibly beautiful and bold, showing the fine line between architecture and sculpture.