Friday rainbow 🌈

The Brandenburg Gate (Russian: Бранденбургские ворота, tr.: Brandenburgskie vorota, German: Brandenburger Tor) is one of seven surviving city gates in Kaliningrad, the former German city of Königsberg. The gate is located on Bagration Street and is the only gate of Kaliningrad still in use for the intended purpose.

Altstadt was a quarter of central Königsberg, Germany. During the Middle Ages it was the most powerful of the three towns that composed the city of Königsberg, the others being Löbenicht and Kneiphof. Its territory is now part of Kaliningrad, Russia.

Haberberg was a mostly residential quarter of southern Königsberg, Germany. Its territory is now part of the Moskovsky District of Kaliningrad, Russia.

The Sackheim Gate (Russian: Закхаймские ворота, tr.: Zakkhaymskie vorota; German: Sackheimer Tor) is one of seven surviving city gates in Kaliningrad, Russia, formerly the German city of Königsberg. It is located at the intersection of Moscow avenue and Lithuanian wall street.

The Seven Bridges of Königsberg is a historically notable problem in mathematics. Its negative resolution by Leonhard Euler in 1736 laid the foundations of graph theory and prefigured the idea of topology.The city of Königsberg in Prussia (now Kaliningrad, Russia) was set on both sides of the Pregel River, and included two large islands - Kneiphof and Lomse - which were connected to each other, or to the two mainland portions of the city, by seven bridges.

Königsberg's New Synagogue (German: Neue Synagoge) was one of three synagogues in Königsberg in Prussia, East Prussia (now Kaliningrad, Russia). The other synagogues were Old Synagogue and Adass Jisroel synagogue. The New Synagogue was destroyed in the aftermath of the Kristallnacht pogrom in 1938. It was reconstructed and reopened in 2018.

Nasser Garten or Nassengarten was a quarter of Königsberg, Germany, located southwest of the city center. Its territory is now part of the Moskovsky District of Kaliningrad, Russia.

The Church of the Holy Family (Russian: Кирха Святого Семейства; German: Kirche zur Heiligen Familie) is a neogothic brick church in Kaliningrad. It was built in the Haberberg city district of Königsberg, near the Pregel river, between 1904 and 1907. The church was designed by architect Friedrich Heitmann and was built for the Catholic immigrants that were coming to Königsberg.

The Propsteikirche (German for "provost church"), also known as the Katholische Kirche (Catholic church), was a Roman Catholic church in the Sackheim quarter of Königsberg, Germany. Its patron saint was John the Baptist.

The Lutherkirche was a Protestant church named after Martin Luther in southern Königsberg, Germany.