Explore details about location Avenida Siglo XXI. Avenida Siglo XXI is a location situated within the Boadilla del Monte alongside other areas such as Calle de la Alberca, Calle Salvador Dalí, Calle Valle de Ansó. Additionally, some smaller parts of Avenida Siglo XXI include specific areas like Avenida Condesa de Chinchón adding to the diversity of its landscape.