The well of Daura, Fadar Daurama Emir's palace, Daura Emirate, Katsina state, Nigeria

Wells Cathedral, a 12th century Anglican cathedral dedicated to St. Andrew the Apostle, seat of the Bishop of Bath and Wells, Wells, Somerset, England, United Kingdom, Europe

Wells Cathedral, a 12th century Anglican cathedral dedicated to St. Andrew the Apostle, seat of the Bishop of Bath and Wells, Wells, Somerset, England, United Kingdom, Europe

Wells Cathedral, a 12th century Anglican cathedral dedicated to St. Andrew the Apostle, seat of the Bishop of Bath and Wells, Wells, Somerset, England, United Kingdom, Europe

Tourist photographs well of griffins and lions by Palazzo del Capitano del Popolo in Piazza Grande, Montepulciano, Tuscany, Italy

Pyramid of the Sun, Plaza de la Luna, Calzada de los Muertos, Avenue of the Dead, Teotihuacan, Mexico, North America

Pyramid of the Sun, Plaza de la Luna, Calzada de los Muertos, Avenue of the Dead, Teotihuacan, Mexico, North America

Camel lying and ruminating in front of the Khazne al Firaun, Al Khazneh treasury building, Petra, Jordan, Middle East

Barges on a loading canal, Hamburg, Germany, Europe

Barges on a loading canal, Hamburg, Germany, Europe

Pyramid of the Sun, Plaza de la Luna, Calzada de los Muertos, Avenue of the Dead, Teotihuacan, Mexico, North America

Rowboat going across the lakes and canals at Schoch's Garden, Kleines Walloch watercourse and the Venus Temple, Dessau-Woerlitz Garden Realm, UNESCO World Heritage Site, Dessau, Saxony-Anhalt, Germany

Steps, Phaistos Palace ruins from the Minoan period, Crete, Greece, Europe

Pyramid of the Moon, Plaza de la Luna, Teotihuacan, Mexico, North America

Panel on the Cologne Cathedral, the Pope's visit to the 20th World Youth Day in 2005, Roncalli Platz, Cologne, North Rhine-Westphalia, Germany, Europe

Terracotta army, part of the burial site, hall 1, mausoleum of the 1st Emperor Qin Shihuangdi in Xi'an, Shaanxi Province, China, Asia

Amphitheatre, Phaistos Palace ruins from the Minoan period, Crete, Greece, Europe

Queen Elizabeth II attending Wimbledon for the first time in 33 years, Wimbledon Championships 2010, Wimbledon, United Kingdom, Europe

Steps, Phaistos Palace ruins from the Minoan period, Crete, Greece, Europe

Intercom for prisoners and their visitors in the prison, Alcatraz Island, California, USA

Santa Cristina sacred well in Paulilatino, Oristano, Sardinia, Italy