The world's oldest badminton tournament, the All England Open Badminton Championships, is held annually in England. It is one of the only three Super 1000 level tournaments, the others being the China Open and the Indonesia Open.
In 1898, the world's first open tournament was held in the town of Guildford and it was widely successful. This paved the way for the All England's inaugural edition, which was held at London's Horticultural Halls in 1899. The inaugural edition consisted of just the doubles format, but from the second edition onwards, the singles were introduced.
Eventually, the tournament was considered the unofficial world championship of the sport until 1977, when the International Badminton Federation launched its official championships.