Yeah, I saw that thing for years and never figured out what it was. Apparently it's a Sufi Muslim Mosque. If you look at the satellite/aerial images of it they have a big outdoor circle in the back of the building, with a raised pillar in the middle. Some Sufis do this dance around that thing, like this:
They are considered "Mystical".
However, that place does seem so heavily veiled in secrecy, I wonder if anything else goes on there. I mean, they've had a website at one point in time or another, but it's more like a retreat than an open mosque.
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"And if any women or children get their legs torn off, or faces caved in, well, it's tough shit for them." -2LT. Bert Stiles, 505th, 339th (On Berlin Bombardier Mission, 1944).