Great Saint Martin Church - Credit: Wikimedia Commons
The Great Saint Martin Church (, mostly shortened to Groß St. Martin, or , ) is a Romanesque Catholic church in Cologne, Germany. Its foundations (c.960 AD) rest on remnants of a Roman chapel, built on what was then an island in the Rhine. The church was later transformed into a Benedictine monastery. The current buildings, including a soaring crossing tower that is a landmark of Cologne's Old Town, were erected between 1150-1250. The architecture of its eastern end forms a triconch or trefoil plan, consisting of three apses around the crossing, similar to that at St. Maria im Kapitol. The church was badly damaged in World War II; restoration work was completed in 1985. Read more on Wikipedia
Source: en.wikipedia.org