That's amazing Gill - but Family History Research has a habit of throwing up coincidences like that, as I'm sure you've found out.
Funnily enough when we first went to Germany we lived in a small village called Schliengen-Liel, (in der nähe von Freiburg im Breisgau) and we were also near Basel and the Alsace, which we'd visit often. Some years later, we moved to Freiburg itself. Great times. See photo of Basel Stadt