“An absolute must because there aren’t many original Berlin Wall remnants left.”—Andrea Steichele-Biskup. Longest section (0.75 mile or 1.3 kilometers) of the Berlin Wall still standing; open-air gallery since 1990 with 106 murals by artists from 21 countries. Mühlenstrasse between Oberbaumbrücke (Oberbaum bridge) and Ostbahnhof