Wednesday, Aug 26, 2020, 5:59 pm

By:Tony Williams

#9 16th Avenue - San Francisco

The world's longest mosaic staircase, the tiled steps on 16th Avenue in San Francisco has 163 steps and ascends 82 feet high. Designed by Irish ceramicist Aileen Barr and mosaic artist Colette Crutcher, it was built over two and a half year. Completed in August of 2005, 2000 handmade tiles were used.