A church for eternity
It's not a ruin, but nevertheless a memorial: In Düsseldorf, a huge bunker was designed as a church for reasons of camouflage in the early 1940s. It finally became a church in 1949. The unique building is a protected monument, and is said to be the world's most stable place of worship. Today, the bunker is not only a church, but also a memorial and an art center.