Speaking at the Berlin Wall, on June 12, 1987, Reagan challenged
Gorbachev to go further:
“General Secretary Gorbachev, if you seek peace, if you seek prosperity for the Soviet Union and Eastern Europe, if you seek liberalization: Come here to this gate! Mr. Gorbachev, open this gate! Mr. Gorbachev, tear down this wall! (Wikipedia, Oct 7, 2007)
This portion of the wall is located at the Ronald Reagan Presidential Library in Simi Valley, California.