The 'Night Watchman'...he is quite the eccentric.
One of the gates into the city (main night gate).
At night the bell would ring 1 hr before the gates closed (everyone knew to get inside before the gates to the city closed). If you didn't make it in...there was only one option: The 'Man Hole' - yep only fits 1 man and is very expensive to use. They would stay in the 'hole' until the gates opened in the AM and pay up. 
Yes, those are Franconian wine bottles tied together. It's the entrance to a 'Wein Bar'.
Schuss!
