Koenigsberg cathdedral prior to its restoration circa 1988 courtesy https://en.wikipedia.org/wiki/K%C3%B6nigsberg_Cathedral.
In the early 1990's, with the opening of the Soviet Union to foreigners, people showed a renewed interest in the Koenigsberg Cathedral. In 1994, a new spire was added to the roof using a helicopter. Over the next decade, Koenigsberg Cathedral's interior was rebuilt, including an Orthodox chapel, a Lutheran chapel and a museum. The Lutheran chapel is the location of where the 100 Koenigsbergers hid during the Second World War Allied bombing of their city.
Koenigsberg Cathedral today courtesy https://en.wikipedia.org/wiki/K%C3%B6nigsberg_Cathedral.
Note: For more information, read A Childhood Under Hitler and Stalin by Michael Wieck.