4. Lisbon
Citation:
Picture 1: http://www.daily-art.com/wp-content/uploads/2014/01/David-Walker-Street-Art-1.jpg
Picture 2:
http://4.bp.blogspot.com/-_8T5JmTD6mA/UlTOCq6mmeI/AAAAAAAAFVw/jzJrlUyc4CI/s1600/100_1087.JPG
Picture 3:
http://3.bp.blogspot.com/ZVnnkHJaoTA/TbY8LRCepSI/AAAAAAAAAIo/7RM4veWJ5gA/s1600/Ireland+Trip+497.JPG
Picture 4: http://1.bp.blogspot.com/fKGIZ231neQ/Tea3CgYHqxI/AAAAAAAAMX4/Fx5g_P_whew/s1600/graf181.JPG
Picture 5: http://bigcitiesbrightlights.files.wordpress.com/2012/05/lx-streetart-001.jpg
Picture 6: http://payload.cargocollective.com/1/0/633/431289/Os-Gemeos_Blu_Lisbon_5_u.jpg