In one of the film's key scenes, Marieke tells Storm she often risks the perilous climb to the cathedral's tower, the city's highest point, to take in the breathtaking view and contemplate. To realise this scene, two actors were shot in a simple set piece in front of green screen. This footage was used in multiple shots in which we orbit the church and see the city below in all it's splendor.
Other shots involve matte paintings, and enriching shots with assets such as ships in harbors and removing anachronistic elements.