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Detail of the Erechtheion (Temple of Athena Polias), an ancient Greek Ionic temple on the north side of the Acropolis, UNESCO World Heritage Site, Athens, Greece, Europe

Detail of the Erechtheion (Temple of Athena Polias), an ancient Greek Ionic temple dedicated to the goddess Athena, on the north side of the Acropolis, UNESCO World Heritage Site, Athens, Greece, Europe

Adult red-footed booby (Sula sula) head detail in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult red-footed booby (Sula sula) at sunset in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

An adult Galapagos dove (Zenaida galapagoensis) on Espanola Island in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

An adult Galapagos dove (Zenaida galapagoensis) on Espanola Island in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult bull Galapagos sea lion (Zalophus wollebaeki) posturing on Fernandina Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lion (Zalophus wollebaeki) mother and pup on San Cristobal Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lion pup (Zalophus wollebaeki) underwater playing with a lobster molt in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion (Zalophus wollebaeki) underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion bulls (Zalophus wollebaeki) mock-fighting in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion bulls (Zalophus wollebaeki) mock-fighting in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion bulls (Zalophus wollebaeki) mock-fighting in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion bulls (Zalophus wollebaeki) mock-fighting in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lions (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lions (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lions (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The Stradun (Placa Ulica) and Tower of the Franciscan Monastery, Old Town (Stari Grad), UNESCO World Heritage Site, Dubrovnik, Dalmatia, Croatia, Europe

Church of St. Blaise with Cathedral of the Assumption of the Virgin Mary beyond, Old Town (Stari Grad), UNESCO World Heritage Site, Dubrovnik, Dalmatia, Croatia, Europe

The Stradun (Placa Ulica) and Tower of the Franciscan Monastery, Old Town (Stari Grad), UNESCO World Heritage Site, Dubrovnik, Dalmatia, Croatia, Europe

Historic Hanseatic quarter, UNESCO World Heritage Site, Bergen, Vestland, Norway, Scandinavia, Europe

Historic Hanseatic quarter, UNESCO World Heritage Site, Bergen, Vestland, Norway, Scandinavia, Europe

Historic Hanseatic quarter, UNESCO World Heritage Site, Bergen, Vestland, Norway, Scandinavia, Europe

Historic Hanseatic quarter, UNESCO World Heritage Site, Bergen, Vestland, Norway, Scandinavia, Europe

The Lindblad Expeditions ship National Geographic Sea Bird operating in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

The Lindblad Expeditions ship National Geographic Sea Bird operating in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Guests from the Lindblad Expeditions ship National Geographic Sea Bird in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

The small temple, dedicated to Nefertari and adorned with statues of the King and Queen, Abu Simbel, UNESCO World Heritage Site, Egypt, North Africa, African

The small temple, dedicated to Nefertari and adorned with statues of the King and Queen, Abu Simbel, UNESCO World Heritage Site, Egypt, North Africa, Africa

Durham Cathedral floodlit at dusk, UNESCO World Heritage Site, Durham, County Durham, England, United Kingdom, Europe

Floating icebergs, Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Floating icebergs, Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Aerial of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Landscape of Valle de Vinales National Park, UNESCO World Heritage Site, Pinar del Rio Province, Cuba, West Indies, Caribbean, Central America

View of O'Neill Butte on the left and Grand Canyon on the right from the edge of Cedar Ridge along the South Kaibab Trail, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

African forest elephants (Loxodonta cyclotis) at Dzanga Bai, UNESCO World Heritage Site, Dzanga-Sangha Special Reserve, Central African Republic, Africa

The Terrace of the Elephants, part of the walled city of Angkor Thom, a ruined temple complex in Angkor, UNESCO World Heritage Site, Cambodia, Indochina, Southeast Asia, Asia

Motoscafi, taxi-boat moored on Grand Canal, Venice, UNESCO World Heritage Site, Veneto region, Italy, Europe

Architectural detail of the central nave of Saint Peter's Basilica in Vatican City, the papal enclave in Rome, UNESCO World Heritage Site, Rome, Lazio, Italy, Europe

Basilica of St. Mary of Health (Santa Maria della Salute), UNESCO World Heritage Site, Venice, Veneto region, Italy, Europe

Architectural detail of the ceiling of Saint Peter's Basilica in Vatican City, the papal enclave in Rome, UNESCO World Heritage Site, Rome, Lazio, Italy, Europe

Architectural detail of the ceiling of Saint Peter's Basilica in Vatican City, the papal enclave in Rome, UNESCO World Heritage Site, Rome, Lazio, Italy, Europe

Detail of the funerary monument to Pope Innocent XI, by the French sculptor Pierre-Etienne Monnot, housed within St. Peter's Basilica in Vatican City, the papal enclave in Rome, UNESCO World Heritage Site, Rome, Lazio, Italy, Europe

Small canal beside the Piazzale Roma in Santa Croce district, Venice, UNESCO World Heritage Site, Veneto region, Italy, Europe

Kayak trip on a canal of Burano island, Venice, UNESCO World Heritage Site, Veneto region, Italy, Europe

View of the circle of mountains, location of the historic and archaeological Nabataean city of Petra, UNESCO World Heritage Site, Jordan, Middle East

Al-Khasneh (The Treasury) seen from the Siq, the historic and archaeological Nabataean city of Petra, UNESCO World Heritage Site, Jordan, Middle East

Al-Khasneh (The Treasury) seen from the Siq, the historic and archaeological Nabataean city of Petra, UNESCO World Heritage Site, Jordan, Middle East

Man riding a horse along the access track to the gorge of Petra, UNESCO World Heritage Site, Jordan, Middle East

Aqueduct dug into the walls of the Siq, narrow gorge leading to the historic and archaeological Nabataean city of Petra, UNESCO World Heritage Site, Jordan, Middle East

Historic and archaeological Nabataean city of Petra, UNESCO World Heritage Site, Jordan, Middle East

The Forth Rail Bridge, a 19th century girder bridge crossing the Firth of Forth estuary, UNESCO World Heritage Site, Scotland, United Kingdom, Europe

San Vincenzo Ferreri church, Stromboli, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Galapagos Land Iguana (Conolophus subcristatus), large lizard can can grow to five feet long and live for 60 years, South Plaza island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Wide-angle view of Patan Durbar Square with ancient temples and people walking through the UNESCO World Heritage Site at dusk

Colors and decoration of the romanticist castle Palacio da Pena, UNESCO World Heritage Site, Sao Pedro de Penaferrim, Sintra, Lisbon district, Portugal, Europe

Pinnacle Rock on Bartolome Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

View from Kasra Fortress on the ancient Incense Route, a World Heritage Site,desert of Negev,Israel,Middle East,Western Asia

View from Kasra Fortress on the ancient Incense Route, a World Heritage Site,desert of Negev,Israel,Middle East,Western Asia

Statues and dome of the Baptistery at sunset, Piazza dei Miracoli (Piazza del Duomo), UNESCO World Heritage Site, Pisa, Tuscany, Italy, Europe

Cathedral (Duomo) and Leaning Tower at night, Piazza Dei Miracoli, UNESCO World Heritage Site, Pisa, Tuscany, Italy, Europe

Young Indian Girl in front of Humayun's Tomb, UNESCO World Heritage Site, Delhi, India, South Asia, Asia

Sun setting at the Taj Mahal, UNESCO World Heritage Site, Agra, Uttar Pradesh, India, South Asia, Asia

Sun setting at the Taj Mahal, UNESCO World Heritage Site, Agra, Uttar Pradesh, India, South Asia, Asia

Young Indian woman in front of the Taj Mahal, UNESCO World Heritage Site, Agra, Uttar Pradesh, India, South Asia, Asia

Young Indian woman in front of the Taj Mahal, UNESCO World Heritage Site, Agra, Uttar Pradesh, India, South Asia, Asia

Young Indian woman in the Agra Fort (Red Fort), UNESCO World Heritage Site, Agra, Uttar Pradesh, India, South Asia, Asia

Front view of Pisa Baptistery of St. John at dusk, Piazza dei Miracoli (Piazza del Duomo), UNESCO World Heritage Site, Pisa, Tuscany, Italy, Europe

View of Guglia dell'Immacolata monument in Piazza Gesu Nuovo, Historic Centre, UNESCO World Heritage Site, Naples, Campania, Italy, Europe

High section of Pisa Leaning Tower and marble statues of fountain, UNESCO World Heritage Site, Pisa, Tuscany, Italy, Europe