1.   The Gothic vault is a framework of stone ribs which support thin stone panels filled in later over the centering.

2.   German builders tended to adopt the Gothic vault and the pointed arch to go with it, but little else.

3.   The nave and choir have the usual Gothic ribbed vault but in the aisles the Piast vaulting can be clearly studied.

4.   The choir, with its carved wood stalls and Gothic vault is the most impressive part.

5.   The horror of the Holocaust overtook Rudi Raab four years ago as he stood below the soaring Gothic vaults of the Cologne Cathedral in his native Germany.