The Parque de Retiro is one of the largest parks in Madrid. Centrally located, the park is just east of the Prado. The site belonged to the Spanish Monarchy until the late 19th century, when it became a public park filled with beautiful sculptures, a peaceful lake, graceful paths wonderful for running. Running along the edge of the park makes for a great loop that hits all the sites, which include Palacio de Cristal, an 1887 glass house hosting contemporary art. Additionally, there are many smaller paths crossing the park. Feel free to experiment with your own route or take ours! It’s about 2km north-south and a little over 1km east west.