MADRID—UNESCO added Madrid’s historic Paseo del Prado boulevard and Retiro Park to its list of world heritage sites on Sunday. The tree-lined Paseo del Prado, in the center of the Spanish capital, is home to the Prado museum, while Retiro Park, just off the Paseo del Prado, is one of the city’s most visited attractions. “I think it’s wonderful, it’s part of Spain’s heritage that we have to value,” said Eloy Moreno, 31, who was walking along the Paseo del Prado on Sunday afternoon. El Retiro (“The Retreat”), an urban green space with a boating lake enjoyed by both locals and tourists, was originally a palace and gardens built for the personal use of King Felipe IV in the 17th Century. “I’m not from here and the first thing I was shown was the Retiro, the Prado … Culturally it enriches you, I think it’s very good that UNESCO has …