Indeed. The large building in the center with two courtyards, as well as the surrounding gardens, larger buildings, and bodies of water are all part of it. I tried to leave enough surroundings to at least give a concept of place as a hint, for someone with a skilled eye.
...Actually, he left two different collections, one in a museum in L.A., and this one, in a historically accurate reproduction of a mountainside villa from pre-Vesuvius Herculaneum.
That would be the world's largest swimming pool at the San Alfonso del Mar resort in Chile.
Excellent puzzle. Sorry it took so long to get a chance to sit down and figure it out. (You'll notice it's 2:30 AM here in Beantown... Gives you an idea of how much time I have to myself.)
I'll post clues if people actually need/want them. I'm not going to bother until I'm sure that people are actually looking, given the general slowness of this topic lately.