"Beyond the Round Tower - The Cathedral The Trinitatis Church was built in the mid 1600s at the same time as the Round Tower astrological observatory which is attached to it and replaces what would otherwise be its bell tower. Trinitatis Church is part of the Trinitatis complex and was used by the University of Copenhagen for much of it's history. The church is accessed through doors to the side which is slightly deceptive and causes my visitors to overlook it. The church is representative of the massive building projects that defined Christian IV's reign."