The Arena Theatre  on the Ramparts was erected in the year of 1869 in the area of the Chotek public orchards, in the location of the citadel N. 26 above the Horse Gate due to the effort of the Cooperative of the Czech Regional Theatre. The design was again elaborated by Josef Niklas. The wooden arena on a brick foundation wall of  was large and roofless. It constituted a distinct landmark of the Horse Market at that time with its four towers. The architect inserted a horseshoe-shaped auditorium into a rectangular structure with 218 seats in the stalls, 120 seats in 24 boxes, 129 seats in the dress circle and 127 in the upper circle, therefore there were altogether 594 seats and several hundreds of standing rooms as well. It could accommodate about 1200 spectators. The curtain and decoration was created by painter Macourek. This very popular arena was transferred to another location during tearing down the fortification in 1876.