London's landmark 'Big Ben' marks 160 years with silence as restoration work continues(1/7)

Photo taken on Feb. 7, 2013 shows the clock's hour bell nicknamed 'Big Ben' in London, Britain. The "Big Ben" bell turns 160 years since it began striking the hour on July 11, 1859. (Jessica Taylor/UK Parliament handout via Xinhua)

Photo taken on Feb. 7, 2013 shows one of the four quarter bells in the Bellfry in London, Britain. The "Big Ben" bell turns 160 years since it began striking the hour on July 11, 1859. (Jessica Taylor/UK Parliament handout via Xinhua)

Photo taken on March 14, 2018 shows decorative roof parts being inspected in London, Britain. The "Big Ben" bell turns 160 years since it began striking the hour on July 11, 1859. (Mark Duffy/UK Parliament handout via Xinhua)

Photo taken on April 21, 2016 shows detail of the Great Clock mechanism in the Elizabeth Tower in London, Britain. The "Big Ben" bell turns 160 years since it began striking the hour on July 11, 1859. (Jessica Taylor/UK Parliament handout via Xinhua)

Photo taken on April 21, 2016 shows detail of the Great Clock mechanism in the Elizabeth Tower in London, Britain. The "Big Ben" bell turns 160 years since it began striking the hour on July 11, 1859. (Jessica Taylor/UK Parliament handout via Xinhua)

Photo taken on May 21, 2019 shows the finished north dial of the Big Ben in London, Britain. The "Big Ben" bell turns 160 years since it began striking the hour on July 11, 1859. (Jessica Taylor/UK Parliament handout via Xinhua)

Photo taken on May 21, 2019 shows gilding of cast iron roof elements of the Big Ben in London, Britain. The "Big Ben" bell turns 160 years since it began striking the hour on July 11, 1859. (Jessica Taylor/UK Parliament handout via Xinhua)