Lilith Grey:
Lilith takes a deep breath before pushing open the gate. "Hello?" She calls out as she steps inside.
No sounds come from inside, at least none that Lilith can hear so far.
No horrible spiderwebs in her hair, either. Which figures, if someone's been coming and going from here every 2 or 3 days (or more often).
She steps forward to the far wall. Yes, there are the rings in the wall... One could imagine that they might hold torches, or the stems of cut flowers... but yes, just as Harry instructed, Lilith can see how the ring in the mouth of the middle lion could conceivably pulled, to open a secret door...
Except...
...The wall isn't really at a 90-degree angle to the side walls. It sort of--
Oh dear. The door isn't shut properly. It's already open a crack.
...Has the other time-traveler from the future (1795's future, anyway) decided to take himself for a walk...?