muddy, wet gravel parking lot at holzmaar, gillenfeld in the eifel

snow winter tree freezing blizzard frost sign ice branch plant signage lane white wall forest advertising road traffic holzmaar caldera lake gillenfeld eifel lakes called maar area high density volcano one touristic path walk swimming nature reserve autumn colors change ways sun shadow sides crater curvy regionally wooden platform mirror calm reflected snowy gravel slippery bridge country muddy wet parking lot