The Basilica of the Holy Apostles is a Romanesque church in Cologne , located near Innenstadt’s busy Neumarkt. The former collegiate church is dedicated to the twelve Apostles. It is one of the twelve Romanesque churches built in Cologne in that period.The church has a basilical plan of nave and aisles, and like Groß St. Martin and St. Maria im Kapitol, has three apses at the east end making a trefoil plan. There is a single tower of 67 metres at the west.

More details: https://en.wikipedia.org/wiki/Basilica_of_the_Holy_Apostles,_Cologne