Cologne Cathedral

The Cologne Cathedral is a Roman Catholic church located in Cologne, Germany.

During World War II, a Piece of Eden had been hidden in one of the cathedral's spires. Barthel Schink, a member of the Edelweiss Pirates, intended to bring the artifact to the Assassins in Paris before he was captured and sentenced to death by the Nazis. Instead, Miriam Kurtz recovered the artifact at his request.

Reference

 * Assassin's Creed IV: Black Flag