Königsberg was a historic city located in East Prussia, now known as Kaliningrad, Russia. It was founded in the 13th century and became an important cultural and economic center in the region. The city is famous for its unique layout, which included several islands connected by bridges, inspiring the famous mathematician Leonhard Euler to develop the concept of graph theory through the "Seven Bridges of Königsberg" problem. Throughout its history, Königsberg was influenced by various cultures, including German, Polish, and Russian. It was the birthplace of notable figures such as the philosopher Immanuel Kant. After World War II, the city was annexed by the Soviet Union, leading to significant demographic and architectural changes.