In London's Barbican district, near St. Paul's Cathedral and overlooking the city's Roman and medieval walls, this museum traces the history of London from prehistoric times to the 20th century through archaeological finds; paintings and prints; social, industrial, and historic artifacts; and costumes, maps, and models. Exhibits are arranged so that you can begin and end your chronological stroll through 250,000 years at the main entrance to the museum. The museum's pièce de résistance is the Lord Mayor's Coach, a gilt-and-scarlet fairy-tale coach built in 1757 and weighing in at 3 tons. You can also see the Great Fire of London in living color and sound in an audiovisual presentation; the death mask of Oliver Cromwell; cell doors from Newgate Prison, made famous by Charles Dickens; and most amazing of all, a shop counter showing pre-World War II prices. Early in 2002, the museum unveiled its latest permanent gallery, occupying an entire floor. Called the World City Gallery, the exhibit examines life in London between 1789 and 1914, the beginning of World War I. Some 2,000 objects are on view.