Is it a memorial, an artwork, or a tourist attraction? In February 1990 artists from around the world began to paint their works on a leftover piece of the Berlin Wall. It became what may be the largest open-air gallery in the world. We look back at 25 years of a remarkable post-Cold War art project.
http://www.dw.de/berlins-east-side-gallery-celebrates-25-years/g-18229363