Fort on Tabul hill The main purpose of the structure was to advance the defenses of the bastion fort on its western side while preventing an attack on the town from Tabula Hill. The massive lunette-shaped fortress was made up of four lines of defence separated by a dry moat. The outer defensive line was a front line with a covered road. This line included an underground system of brick mine tunnels. Fort Tabulový vrch is currently owned by the University Hospital.