Germany trips - Koln - Kolner Dom (6)

Source: http://en.wikipedia.org/wiki/Cologne_Cathedral

Ancient site
When the present Cologne Cathedral was commenced in 1248, the site had been occupied by several previous structures, the earliest of which may have been a grain store, perhaps succeeded by a Roman temple built by Mercurius Augustus. From the 4th century the site was occupied by Christian buildings including a square edifice known as the "oldest cathedral" and commissioned by Maternus, the first Christian bishop of Cologne. A second church, the so-called "Old Cathedral", was completed in 818. This burned down on April 30, 1248.