What an interesting building this on built on the water. Is this a lake or a larger body of water? The image,especially the sky appears a bit grainy. You have great captured great color here. Thank you & welcome to caedes.net. :~)
Here you can find an aerial picture of the Riksdaghuset:
CLICK HERE
If you zoom out, you can see it sits on one of the many islands of which Stockholm consists. I'm not sure whether this is just one of those islands, or if it's an artificial one, specially made for this building.