This Marylebone landmark is one of London's most popular sights, with 2.7 million visitors a year - to avoid long lines, buy tickets in advance. Much of the modern Madame Tussaud's is made up of the Garden Party exhibition, where you can have your picture taken alongside wax models of actors and singers. The Grand Hall is home to world leaders past and present, to the royal family and to pop stars, and the Chamber of Horrors has been revamped.