What about a spring in Samothrace? A base camp in Vatos to explore the bright side of the moon in better conditions than in summer. Got three crucial paths on GPS tracks and made some inox bolt placements to the via ferrata made by canyoneers in 2008 leading to (or escaping from) the big waterfall Kremastos.
For the tracks:
Vatos – Kremastos (upper part – canyoning entrance).