Part of the Acropolis, the Odeon of Herodes Atticus is a stone Roman theatre. The structure was completed in 161 AD only to become a ruin a hundred years later. The amphitheatre went through a series of renovations throughout the centuries and now host a wide variety of cultural events. The venue is widely known by locals as simply Herodeon.

El Retiro, an iconic park in Madrid, was once reserved exclusively for Spanish royalty, but it became accessible to the public in the late 19th century. Covering 350 acres, it is one of the largest parks in the city and is often referred to as 'the lungs of Madrid' due to its vast green spaces. It's a popular spot for leisure, sports, and outdoor activities, with wide avenues and flat terrain perfect for running, cycling, and skating. You can also rent rowboats to paddle around the pond or enjoy a horse-drawn carriage ride. The park is home to several architectural and historical features, including the Velázquez Palace and the Crystal Palace, as well as remarkable sculptures and fountains, such as the statue of the Fallen Angel, the only sculpture in the world to represent the devil, Lucifer. The park also boasts a Puppet Theatre, which offers a unique program every weekend and is one of a kind in Europe.

Named after Erechtheus, king of Athens and foster son of Athena, the Erechtheion is an ancient Greek temple on the north side of the Acropolis dedicated to both Athena and Poseidon. This intricate temple was designed to accommodate the radically uneven ground on the site and to avoid disturbing sacred shrines like the altars to Poseidon, the sacred olive tree, a well containing sea water, the tomb of Kekrops, and the Pandrosion sanctuary.