St. Paul's Cathedral in London has undergone several rebuilds since the original wooden church was constructed in 604 AD. The current cathedral was designed by Sir Christopher Wren and completed in 1711 after the Great Fire of London destroyed the previous structure. Some key features include the 365-foot tall dome, 121-foot wide nave, and Whispering Gallery that allows voices to be heard across its 112-foot diameter. St. Paul's Cathedral remains one of the most iconic landmarks in London.