We are in the Lightner Museum in Saint Augustine, Florida. This used to be the Hotel Alcazar built by Henry Flagler back in 1878. From the second floor gallery we can look down at the Glass Room floor and see both floors in this panoramic view taken from six stitched together photos. The cut crystal glass can be seen in and on the cases below on the first floor.
I would be terrified my clumsy self would fall and break something. It is beautiful and thanks so much for sharing the photo.