I recently remebered this place, it appears in two games L'sV and MM , the same OST is used for both games.
The OST called Moonlight Museum gets used more often in L'sV than in MM.
From the Outside it looks the same, but the inside is completely different.
The Vision had some puzzles, but I don't really remember this Vision, but it sure did had a nice gravity mechaninc/gimmick.
In the Museum Lolo and Klonoa come across a mirror that shows the past of someone.
We learn in a scene about Lolo's past and right afterwards the mirrior shatters.
When I played this game I expected that Klonoa's (tragic) past will be revealed, but I was disapointed in that regard
This scene actually made me wonder if it was planed that L'sV had a deeper plot, or was more connected to DtP.