Where's Michael? Asking because I don't know

You may have noticed that Michael didn't post on Monday. And you may have interpreted that as him being missing. That is both true and not so much.

Photographic proof of evidence that we were in one spot at the same time at some point.

See, Michael and I were working on a top secret case and he snuck into a top secret crime hideout to do some top secret recon. I was supposed to pick him up after... but I forgot where I dropped him off. So he's where he's supposed to be (presumably) but I don't know where that is. Hence, not missing and missing.
If anyone has any ideas where he might be, it might help. Here's what I remember:

• There's a castle, with parapets and everything
• Lots of people
• A serious rodent infestation
• Curiously clean in spite of the rodents
• Hot!
• A whole bunch of presidents
• Dwarfs
• Talking animals that don't talk
• Modes of transportation that Henri Petit would not be eligible to ride

Seems like I should know where this is.