This is the amazing wooden staircase in the Ontario Art Gallery. If you visit, be sure to enjoy yourself, since the entry fee is an eye-watering $25.
Himeji Castle in Japan at sunset. It's one of only 12 surviving original castles in Japan and is a world wonder in my opinion. If you are in Japan DO NOT miss seeing this castle.
I think this is actually called the Atrium mall, but I'm not completely sure. I found this while wandering around downtown Toronto. An extreme wide angle lens helped to accentuate those diagonal lines.