Most of the walls, inside as well as outside are very dark, some smaller parts have been renovated and are shining white. The renovation is ongoing.
Although already the exterior is worth the visit, one is generally even more impressed by the interior.
What strikes the most may be the stained glass windows (some 150?), with their specific blue dominating colour. They left the cathedral during WWII, but are back. Most of them are as old as the cathedral, or even older. The rose windows date from 1150 to 1230.
The most famous window is perhaps the “Blue Virgin Window”, the centre of which also dates from around 1150.
The remarkable choir screen has been added later and took some 200 years to complete; finished only during the 18th century.
Special attention could also be given to part of the floor, designed and created in 1205 as a labyrinth with a 300 m (1000 ft) path, still used by pilgrims - when the chairs have been removed.
I wish you a nice weekend!