Hamburg Cathedral was originally built as a wooden chapel in the 9th century, soon after it became the seat of the joint Diocese of Hamburg and Bremen. In the elenventh century, Archbishop Adalbrant ordered the construction of a new brick cathedral along his castle. Construction of a third, Brick Gothic cathedral began under Gebhard, Prince Archbishop of Bremen. The new building was consecrated by Archbishop Burchard in 1329. By the mid 15th century, two naves and a tower had been added to the three nave church, and an additional hall was built in the early 16th century.
The decadence of the cathedral started soon after the city's conversion to Lutheranism. It became isolated as a Catholic temple in a Protestant city, and even after it was reopened as a Lutheran parish, its situation as an enclave of the former Archbishopric, now Duchy of Bremen, made its administration difficult. After the Imperial Mediatisation of 1803, the Duchy ceded the former cathedral to the City of Hamburg. The Senate decided to demolish the structure soon after.
I'm posting screencaps by now. A KMZ file will be avaliable for download soon.