- The construction of the Haapsalu Bishop's castle was started in the 13th century. At first, it only contained the Episcopal church, but in 15th century, the church had gotten a massive walls around it and thus, the history of Haapsalu Bishop's castle starts from there. For over three hundred years, the castle served as an official residence for the Saare-Lääne diocese.

- The castle was conquered both by the Swedes and the Russians and finally in 1715, the Tsar Peter I ordered the castle to be blown to pieces, in order to prevent anyone of using it again as a stronghold. In 1726 a fire also destroyed the roof of the church and the congregation could not afford to repair it anymore. For the next 160 years the castle and the church stand as ruins, but from 1886 to 1889 the church was restored by the help from Russian imperial house and from the local nobleman's. The appearance of the church was altered a bit from the original and named as St. Nicholas. The area around the church, with it's castle ruins was turned into a park.

- The second world war brought devastation to the church and the Soviet occupation in 1940, forced the closing of the church. In the chaotic situation of 1944, some hooligans broke into the church and destroyed the altarpiece, organ, chairs and windows. After the second world war, the church was left empty under the Soviet regime and was used to store grains. When Estonia regained it's independency, the church was returned to the congregation and the first service was held in the church, on Christmas 1990.

- The castle area is quite huge, in total it covers nearly a three hectares of land, with seven towers and walls eight to twelve meters high, that are over 800 meters long.

- The deep moat it still visible, but strangely it's located inside the castle and not outside. Of course the last defensive line before the church would have been here, if the enemy would have breached the walls. Outside of the walls, there is no moat at least visible anymore. The town has grown adjacent to the castle and some houses are build right next to the walls, with one of the walls touching the castle walls.

- View from the castle, showing the outer wall and one of the seven towers. Some of the towers are in a very good shape as are some sections of the walls.

- Massive walls stare towards the sea and the modern day Haapsalu town. You wonder what has these walls seen in the past five hundred years? Conquers have come and gone, rulers have changed, still these walls stand here.