Of maastricht! Little did we know that we could go inside till a little old man waved us in. Turns out there were 2 walls defending maasricht; the second one finished in the 1400's. The 2nd line of defense had "galleries" that are still accessible to this day that run inside the 12km (almost 5 miles!!!) Of wall. The narrow passaways are made of brick and for lack of a better word are used as torture chambers! To enter this gate we walked up narrow spiral stone staircases.