Daugavgrīva Castle was originally a monastery converted as a fortress by Swedish in the 17th century. Today there are no remnants of the medieval castle above the soil.
In 1208 there was a Dünaburg castle built by the Teutonic Knights which initially served as a monastery. The Swedish fortress of Dünamünde, designed in a Dutch style by General Rothenburg in 1641, replaced the ruined Daugavgrīva Castle by 1680. In 1695 the Commandant was captain Heinrich Nicolaus Rüdinger, forefather of future Patriarch Alexy II of Russia. Rüdinger was knighted by Charles XI of Sweden. Joachim Cronman later became the Commandant and he died on March 5, 1703.
After the fortress was seized by the Russians they reconstructed it. Regent Anna Leopoldovna of Russia, her husband Anthony Ulrich, and her son Ivan VI were incarcerated in Dünamünde in 1742. A local Lutheran church was rebuilt into the Orthodox Church of the Saviour's Transfiguration in 1775. The Russian government renamed the fortress, where only Russian soldiers were living, to Ust-Dvinsk in 1893. They had its fortifications completely reconstructed prior to World War I. During the war Ust-Dvinsk was bombarded by the Schütte-Lanz Airship SL 7 of the German Army. After the fortress was taken by Imperial Germany, it was inspected by Emperor Wilhelm II in 1917. The Latvian government, however, demolished much of the fortifications several years later. During the Cold War Ust-Dvinsk was a base for Soviet troops. The site is now known in Latvian as Daugavgrīva. There is a functional lighthouse at Daugavgrīva which was originally built in 1818. It was rebuilt in 1863, 1920, and after World War II.
Nowadays entrance in the area of castle goes along the northeastern corner. Still there is partly visible the old road which was leading from northeastern tower around the forepart of the castle up to the southeastern corner.References:
Fisherman's Bastion is a terrace in neo-Gothic and neo-Romanesque style situated on the Buda bank of the Danube, on the Castle hill in Budapest, around Matthias Church. It was designed and built between 1895 and 1902 on the plans of Frigyes Schulek. Construction of the bastion destabilised the foundations of the neighbouring 13th century Dominican Church which had to be pulled down. Between 1947–48, the son of Frigyes Schulek, János Schulek, conducted the other restoration project after its near destruction during World War II.
From the towers and the terrace a panoramic view exists of Danube, Margaret Island, Pest to the east and the Gellért Hill.
Its seven towers represent the seven Magyar tribes that settled in the Carpathian Basin in 896.
The Bastion takes its name from the guild of fishermen that was responsible for defending this stretch of the city walls in the Middle Ages. It is a viewing terrace, with many stairs and walking paths.
A bronze statue of Stephen I of Hungary mounted on a horse, erected in 1906, can be seen between the Bastion and the Matthias Church. The pedestal was made by Alajos Stróbl, based on the plans of Frigyes Schulek, in Neo-Romanesque style, with episodes illustrating the King's life.