El Retiro Park, recently designated as a UNESCO World Heritage Site, is a historic garden and a beloved green space in Madrid, spanning over 125 hectares. It's home to a diverse array of flora, with more than 15,000 trees, and features a variety of attractions, including the Velázquez Palace and the Glass Palace, both used as exhibition halls. Visitors can enjoy a leisurely row across the large artificial lake, explore the numerous sculptures and fountains, or relax in the beautifully landscaped gardens.