Night and long-exposure photography is what got me started in the hobby. You can just get such interesting shots at night, especially in cities that are all lit up at night. Needless to say this is not an HDR image, just a long exposure.
While on vacation in Paris I was walking across a bridge and saw this beautiful scene. Without a tripod I had to improvise by steadying the camera on the cement railing of the bridge.
Technical Specs: Nikon D90, exposure approx. 1 second, f/3.5, ISO 200. Exposure adjustments made in Lightroom.