Can someone please help me to understand these sentences from the Tobira textbook?
秋田市の「竿燈祭り」、仙台市の「七夕祭り」、そして青森市の「ねぶた祭り」。どの祭りもすごいスケール!毎年、日本だけじゃなくて、海外からも観光客がたくさん来るし、とても人気のある祭りだよ。
I am confused about this sentence どの祭りもすごいスケール!. I've never really understood how どの is used outside of a question, so I'm not sure what it means here. I think it might mean something like, each of (the three) festivals is very large?
How specifically are どの and も functioning in this sentence?