One of seven Mashriqu'l-Adhkár (Dawning Place of the Remembrance of God) worldwide, with an eigth in construction. Its the most well known, and widely considered the most beautiful, though the plans for the new one seem to exceed it.
Interestingly, while the picture posted above does indeed give an impression of the overall building, it appears to be something someone cooked up manually! I say this because all Baha'i temples are nine-sided, so that you would typically see four or five sides at once. The picture makes it look six-sided, but was clearly not taken from so close as to eliminate sides from the shot....