In what year was the Berlin Wall erected? Which East German leader ordered its construction? Approximately how many people fled East Germany between 1949 and the year that the Berlin Wall was erected?
What metal did Frank O. Gehry include in the "fish-scale" exterior of the Guggenheim Museum in Bilbao, Spain? For how many years is it expected to endure? From what two sources of potential harm are the glass walls intended as protection?