MANY, often UNMARKED, badly visible CABLES in the whole valley ('Engelbergertal')!!
Access
Cablecar from 'Dallenwil', then gondola from 'Wirzweli'
http://www.wirzweli.ch/
Rules
Airspaces in Switzerland are a tough subject, get all the info you can get before flying.
More info on http://www.flyland.ch.