It was a sombre day in the USA with the 11th anniversary of 9/11. Here are three pictures of the same downtown Pittsburgh scene from my hotel room window Monday night and Tuesday. The very tall building on the left that runs out of the picture is the headquarters of US Steel. It has 64 floors and was completed in 1970. Its outside is steel and it is called – quick, want to guess? – the Steel Building. The Gulf Tower next to it with the colorfully lit top at night has 44 floors and was completed in 1930.
