Um....there is no such thing as Disney California Adventure. There is a Universal Studios Theme Park and yes it does have a spider-man attraction. No Disney theme park has one.

It's located in Universal Studios - Islands of Adventure in Orlando, Florida.

No. The Hogwarts Castle at the Wizarding World of Harry Potter Theme Park houses an attraction. My guess is that while you're waiting in line for the ride, you'll be able to go through and look at key places, such as the Great Hall. But who knows, maybe someday they'll make some common rooms for people to stay in. It would probably be very expensive, though.

its magic

Hogwarts Express.