etna volcano main crater smoking at sunset, sicily, italy

italy mount etna nicolosi sicily active volcano adventure aerial view atmospheric haze blue hour caldera christmas tree city cityscape climbing cold temperature crater footpath hiking landscape majestic moonscape mountain peak range nature nonurban scene outdoors scenic sea ski slope skiing smoke smoking snow covered snowcapped sunrise tourism travel destinations volcanic winter main sunset close-up etna's summit emitting fumes sulfur snow-covered slopes popular