London, England

Tower Hill Sundial:  Two time tracks rim the Tower Hill Sundial: one marks the hours (Roman numerals) and one marks the centuries (bronze bas reliefs).  London Transport (see the Underground marker?) unveiled the timepiece in 1992.  Around its base are bronze bas reliefs that depict, century by century,  the evolution of the city's landscape. The full chronology is laid out at <http://www.streetsensation.co.uk/history/sundial.htm> [2009]