The 18th May is International Museum Day and across the capital the various museums will be putting on a variety of events. Many of the museums will be putting on free events, from the Reina Sofía and the Museum of América to the Templo de Debod and the San Isidro museum. From the 18th to the 23rd May (12 p.m – 5 p.m.) visitors to the Prado Museum will be able to learn more about its history and origins from a guide. The Ministry of Culture has a full list of museums participating, both inside and outside Madrid, just click on museos estatales.