Find a fisherman to take you out on the water at dusk to watch the natural pyrotechnics at their bellowing best.
Check it out while you can: the feed ends at dusk, perhaps when the historical town battens down the hatches—literally.
As dusk approaches, a fog creeps up the slope of the mountain and swallows the sprawling city below—just like Pablo promised.
c.1200, dosk "obscure, to become dark," perhaps from Old English dox "dark-haired, dark from the absence of light" (cognate with Swedish duska "be misty," Latin fuscus "dark," Sanskrit dhusarah "dust-colored;" also cf. Old English dosan "chestnut-brown," Old High German tusin "pale yellow") with transposition of -k- and -s-, perhaps via a Northumbrian variant (cf. colloquial ax for ask). But OED notes that "few of our words in -sk are of OE origin." A color word originally; the sense of "twilight" is recorded from 1620s.