The Clock Tower, at the Palace of Westminster, London, England. This is the world's largest four-faced chiming clock. Also known colloquially as "Big Ben," the stately and commanding presence has stood proudly along the Thames river, in London, England, since 1854. The clock became operational on 7 September, 1859.

Photo: Theresa Hilsdon

Copyright Hilsdon Photography LLC 2008

The Clock Tower, at the Palace of Westminster, London, England. This is the world's largest four-faced chiming clock. Also known colloquially as "Big Ben," the stately and commanding presence has stood proudly along the Thames river, in London, England, since 1854. The clock became operational on 7 September, 1859.

Photo: Theresa Hilsdon

Copyright Hilsdon Photography LLC 2008