Maastricht, probably one of the greatest Citys. I lived there about 10 years ago now and it was great. In fact it was so good, I married one of the locals and therefore have to visit a few times a year!
Sitting on the Vrijtof in summer has to be one of the best sites around ..
All I need now (and to make wife delriously happy), is a job at Eurocontrol!
