 After the battle of Badajoz (1936) of the Spanish Civil War, the Badajoz ring was used as a confinement camp for supporters of the republic and many thousands were executed there by the Nationalist forces who had just occupied the town.Most indoor bullrings, especially in Mexico and elsewhere in Latin America, in addition to being used for concerts, have also been used for indoor sports such as basketball, ice hockey, boxing and lucha libre.The most famous bullrings in the world are Plaza de Toros de Las Ventas in Madrid (Spain), widely regarded as the most prestigious one, La Maestranza in Seville (Spain), and Plaza de Toros México in Mexico City.