<P> West Germans peer at East German border guards through a hole in the wall on 5 January 1990 . </P> <Li> <P> Short section of the Berlin Wall at Potsdamer Platz, March 2009 </P> </Li> <P> Short section of the Berlin Wall at Potsdamer Platz, March 2009 </P> <Li> <P> Souvenir chunk of concrete from the Wall </P> </Li>

Who was president when berlin wall came down