Liberty Bell Center is Philadelphia's top tourist attraction and was commissioned to commemorate the 50th anniversary of the Charter of Privileges (Pennsylvania's constitution, enacted in 1701 by William Penn). The 2080lb bronze bell was made in London's East End by the Whitechapel Bell Foundry in 1751. The bell's inscription, from Leviticus 25:10, reads: 'Proclaim liberty through all the land, to all the inhabitants thereof.' The bell was secured in the belfry of the Pennsylvania State House (now Independence Hall) and tolled on important occasions, most notably the first public reading of the Declaration of Independence in Independence Sq. The bell became badly cracked during the 19th century; despite initial repairs it became unusable in 1846 after tolling for George Washington's birthday.