Most Expensive Watch: Henry Graves ‘Supercomplication’, by Patek Phillips

Price: $24,000,000

One of the most complicated watches ever created, and by far the most complex design conceived without computer assistance. It took three years to design the watch, and another five years to manufacture it, before being delivered to Graves in 1933. The Supercomplication had long been the world’s most complicated timepiece ever assembled with a total of 24 different functions, including Westminster chimes, a perpetual calendar, sunrise and sunset times, and a celestial map of New York as seen from the Graves’s apartment on New York’s Fifth Avenue, and contains 920 individual parts.