1 Big Ben is the largest of five bells of the Westminster Abbey in London
2 Yes, it is. The tower of Big Ben is a symbol of London and Britain. The Spasskaya Tower is a symbol of Russia. You can it in the center of Moscow any time.
3 Yes, it is very old. It is famous for being one of the oldest buildings in London and having for reach history.
4 Westminster Abbey was founded by the Saxon king, Edward the Confessor and consecrated on 28th December, 1065, a few days before his death.
5 The English Parliament works in Westminster Abbey in London. The Russian Parliament works in the State Duma building in Moscow.