Its outside wall features the oldest known coat of arms, which is of 1664.

The 2.6-km wall originally featured 14 towers and six gates.

The women's wall featured one overhang and the mens two.

The wall featured about 300 towers, most of them now entirely or largely ruined.

One wall featured windows, and the other three were mirrored.

One wall of this room features a large window that looks into the adjoining chamber.

To the right, the wall featured a service ladder.

Its north and south walls feature close studding with no middle rail.

Each wall features the name of one of the students who died in the shooting.

The walls are whitewashed and features a large wooden crane.