Spain, Castile and Leon, Avila, City walls that were built from 1090 onwards and are among the best-preserved and most complete in Europe with a memorial to Queen Isabel la Catolica.
20110712
USA, Washington DC, National Mall, Thomas Jefferson Memorial viewed across the Tidal Basin.
20045820
Nepal, Kathmandu, Locally produced solar water heaters on rooftops with black hot water reservoirs.
