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.
I was heading back to my hotel after taking some photos during the blue hour in Toronto, Canada when I found this passageway completely by accident. The little white stripe at the end of the tunnel is some traffic going by.
This is a tower lined with steel plates within one of the museums in Ottawa, Canada. I tried a lot of different angles but I liked this extreme wide angle shot the best, taken straight up.