The Basilica de Nuestra Senora de Guanajuato, the yellow building in foreground, with the blue grey building of the University of Guanajuato behind, in Guanajuato, UNESCO World Heritage Site, Guanajuato State, Mexico, North America

Flowers and hut detail, Sine Saloum Delta, Senegal, West Africa, Africa

View of colourful buildings and rooftops of the Ribeira district, UNESCO World Heritage Site, Porto, Norte, Portugal, Europe

View of colourful buildings and rooftops of the Ribeira district, UNESCO World Heritage Site, Porto, Norte, Portugal, Europe

University of Guanajuato, the blue grey building, in Guanajuato, a UNESCO World Heritage Site, Guanajuato State, Mexico, North America

View of colourful buildings, Guanajuato, Guanajuato State, Mexico, North America

View of colourful buildings, Guanajuato, Guanajuato State, Mexico, North America

Wat Arun (Temple of the Dawn), Bangkok, Thailand, Southeast Asia, Asia

Midnight in City of Reykjavik in far north where tourists often travel to view the Northern Lights phenomenon in the sky, Iceland

View over rooftops of buildings in village of Alvito, Beja District, Baixo Alentejo, Portugal, Europe

Tango demonstration on the rooftop of the Lincoln Hotel, Old Havana, Cuba, West Indies, Central America

Multicolor surfboards strapped to roof of car

Cardiff Castle, detail, mosaic in The roof garden, Cardiff, Wales

Soon U Ponya Shin Pagoda, Sagaing, near Mandalay, Myanmar, (Burma)

Soon U Ponya Shin Pagoda, Sagaing, near Mandalay, Myanmar, (Burma)

Colourful dome of Chiesa Di San Paolo, Saint Paul,??s Church, Olbia, Sardinia, Italy

Soon U Ponya Shin Pagoda, Sagaing, near Mandalay, Myanmar, (Burma)

Cardiff Castle, The roof garden, Cardiff, Wales

Views, Comuna 13, Medellín, Colombia

Views of Comuna 13, Medellín, Colombia

Porto Ferraio, Portoferraio, Spaggia di Capo Blanco, Elba, National Park of the Tuscan Archipelago, Tuscany, Italy

Two women shopping, Chua Cau, Japanese Bridge, Hoi An, Annam, Vietnam

Kilkenny in the day light, Kilkenny, Kilkenny County, Ireland

Blue house at museum town Koprivstiza, Bulgaria, Europe

Colorful houses on hillside, Valparaiso, Chile, South America

Colorful houses and churches in Pelourinho in the historic center of Salvador, Bahia, Brasil

Low angle view of Chartres skyline, France

High angle view of buildings in a city, Innsbruck, Austria

Fireworks light up the night sky over downtown Bangkok on New Years Eve, Bangkok, Thailand

View of a Venetian canal and Giudecca island at sunset from the bell tower of the church of San Giorgio Maggiore, Venice, Italy

View of a canal and lagoon at sunset from the bell tower of the church of San Giorgio Maggiore, Venice, Italy

Colourful houses clinging to the hillside, Zacatecas, Bajio, Mexico