Vor Frelsers Kirke near Christiania. I think this church is about 60-70 meters high and about 300 years old. These stairs is on the outside of the tower and lead to the top of the church. Together with the stairs inside the church it is 400 steps to the top.
Try flipping this picture vertical for a nice effect that I think Jeppe gave me the idea for with his earlier picture of the same church =).