Why Four Castles?

This is the town behind the name:

                                                                   Neckarsteinach

As a little girl, I visited my family in Germany every summer.  We did many day trips, but this is the one we did every single summer.  We took a boat ride to Neckarsteinach, ate lunch at the same restaurant there, then did the walk of the four castles.  The walk ended at a small playground by the river.  

Every year the same, and every year I loved it.