The Old Town Hall was established in 1338 as the seat of the Old Town administration. The oldest part of the complex consists of a beautiful Gothic tower with a bay chapel and a unique astronomical clock – known as the Orloj – where, every hour between 9 am and 11 pm, the twelve apostles appear. The Gothic Revival eastern wing of the Town Hall was destroyed during the Prague Uprising on May 8, 1945 and was never rebuilt. The visitor route includes the historical halls, the tower and the underground areas.
Source : https://www.prague.eu