![Tallest towers, Calgary, Alberta, Canada](http://live.staticflickr.com/65535/49052278368_11278209c8_b.jpg)
The heart of Calgary’s central business district during the blue hour, seen a few days ago. Clockwise from top right: The Bow office building, the double towers of the Suncor Energy Centre, Brookfield Place, Hanover Place (not one of the tall towers, however) and the under-construction Telus Sky.
Also: wide-angle lenses are fun.