Only saw the one, and not for long. I think it was a library of some sort... and the red-eyed version of her, "Poltergeist," was in there. She'd already mostly taken out Tsuna when the rest of us got there.
Yayoi and Watanuki were there too, and we should talk to both of them later, away from Dani, to find out what they might've seen. One of them may have lived long enough to get more information from that place. When I stood against her and tried to talk her down, she ripped out my organs and killed me, so I never saw what happened after that. But there wasn't any reasoning with that part, not then anyway.