Bert Monroy's Damen Station.

Bert Monroy created this photo-realistic picture of Damen Station on Chicago’s Blue Line using Photoshop.

From the website, on the details of the amazing pic:

Adobe Illustrator was used for generating the majority of the basic shapes as well as all the buildings in the Chicago skyline.
The rest was created in Photoshop.
• The image size is 40 inches by 120 inches.
• The flattened file weighs in at 1.7 Gigabytes.
• It took eleven months (close to 2,000 hours) to create.
• The painting is comprised of close to fifty individual Photoshop files.
• Taking a cumulative total of all the files, the overall image contains over 15,000 layers.
• Over 500 alpha channels were used for various effects.
• Over 250,000 paths make up the multitude of shapes throughout the scene.

Link (via Digg)