Mosaic Staircase in San Francisco

It contains over 2,000 handmade tiles and 75,000 fragments of tile, mirror and stained glass. A total of 163 separate mosaic panels created, one for each step riser. 

(Source: http://www.mymodernmet.com/profiles/blogs/16th-avenue-tiled-steps-san-francisco )

Irish ceramist Aileen Barr and mosaic artist Colette Crutcher joined forces, working with over 300 community volunteers for over a two and a half year period until they unveiled the project in August 2005.