The philosopher Immanuel Kant died here, when it was still Königsberg in Prussia.
Originally he was put to rest within the Cathedral but was later moved to where he rests now.
His mausoleum is one oft he very few things still left from German times, most of it has been removed by the Russians, including quite a number of graveyards throughout the city.
They are now parks and recreation areas.
Kaliningrad had been German since the Middle Ages.
Damaged almost beyond recognition in WWII, the easily accessible Baltic seaport became Russian, an enclave between Lithuania and Poland, all the Germans had to go.
Kants grave is one oft he few traces left.
The famous philosopher taught at Königsberg University and died in 1804.