Surprisingly, this photo is actually taken outdoors. That's just how opulent the Jame'asr Hassanil Bolkiah Mosque is. I could easily be mistaken, but I believe the escalator in the center is reserved for the Sultan himself.
Walking around the mosque, the grounds and the structures themselves are all quite decadent. The materials were imported and it seems that no expense was spared.
Entrance to the Jame'asr Hassanil Bolkiah Mosque.