The Museum of Public Art is also known as the Museo al Aire Libre de la Castellana. An overpass over the Paseo de la Castellana was inaugurated in 1970. The overpass would join the eastern and western parts of the city and the roads joined by the overpss were Juan Bravo and Eduardo Dato. The engineers who built the overpass were Alberto Corral López Dóriga, José Antonio Fernández Ordóñez and Julio Martínez Calzón. The engineers talked to the artist Eusebio Sempere to build an open air museum of modern sculpture under the overpass. Sempere was able to get donations of the sculptures from the artists and their families. The museum was opened in 1972. There are 17 artists represented, including Andreu Alfaro, Eduardo Chillida, Martín Chirino, Amadeo Gabino, Julio Gonzalez, Rafael Leoz, Marcel Marti, Joan Miro, Pablo Palazuelo, Manuel Rivera, Gerardo Rueda, Alberto Sanchez, Eusebio Sempere, Pablo Serrano, Francisco Sobrino, Jose Maria Subirachs and Gustavo Torner.

Joan Miro's Mere Ubu was made in 1975 and is made in bronze.