A few nice visual art images I found:
seoul.street.art.cover
Image by atto11
Cover image from the Seoul South Korea Street Art Graffiti Book. By A. Tarantino. SeoulStreetArt.com
The book contains over 100 original photos taken within city limits over many years to help preserve the mediums aesthetic in print.
Dresden_2010_07_ 145
Image by rs-foto
Dresden 2010 | Brühlsche Terrasse, Hochschule der bildenden Künste | Bruhl’s terrace, academy of visual arts