After the success of the 1896 Games, the Olympics entered a period of stagnation which threatened its survival. The Olympic Games held at the Paris Exposition in 1900 and the Louisiana Purchase Exposition at St. Louis in 1904 failed to attract much participation or notice. Of the 650 athletes in the 1904 Olympics, 580 were American; the winner of the marathon was later disqualified upon discovery of a photograph of him riding in a car during the race. The Games rebounded with the 1906 Intercalated Games (so-called because they were the second Olympics to take place within the third Olympiad), which were held in Athens. These Games attracted a broad international field of participants and generated a great deal of public interest, marking the beginning of a rise in both the popularity and the size of the Olympics. The 1906 Games were officially recognised by the IOC at the time (although not any longer), and no Intercalated Games have been held since.