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1.Aššur
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The picture is of the restored Adad Gate, which has subsequently been destroyed by ISIS. The other pictures are of the ruins of Thebes, Persepolis and Mohenjo-daro.
2.Luoyang
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The photo is of the Longmen Grottoes, located 7.5 miles south of present-day Luoyang. The other sites are located in Kaifeng, Beijing and Xi'an.
3.Gondar
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The image is of the Fasil Ghebbi, located in the city. The other sites are Great Zimbabwe, the church Biete Maryam in Lalibela and the Great Mosque of Djenné.
4.Corinth
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The photo is of the Temple of Apollo. The other sites are the Temple of Bacchus in Baalbek (formerly Heliopolis), the theatre of Leptis Magna and the Parthenon in Athens.
5.Palenque
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The image is of the Palace of Palenque. The other images are of the Maya sites of Tikal and Chichen Itza and the Huastec site of Castillo de Teayo.
6.Ayutthaya
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Depicted is the Wat Phra Si Sanphet, a temple that was part of Ayutthaya. The other images are of the Bayon (which was part of Angkor), the Shwedagon Pagoda in Yangon and the temple of Borobudur on the island of Java.
7.Machu Picchu
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The photo is of the Torreon, or Temple of the Sun. The other sites are Sacsayhuamán (near Cusco), Cojitambo and Pinkuylluna.
8.Winchester
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The image is of the city's cathedral. The other images depict York Minster, Canterbury Cathedral and Salisbury Cathedral.
9.Memphis
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Saqqara served as the necropolis for Memphis, and the Pyramid of Djoser (pictured) is located at Saqqara. The other sites are the Temple of Hatshepsut and the Temple of Edfu in Egypt, and the Pyramids of Meroë in Sudan.
10.Isfahan
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The photo depicts the Allahverdi Khan Bridge. The other images are of Qom, Samarkand and Cairo.
11.Teotihuacan
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The other images depict the Aztec site Acatitlan, the Zapotec capital Monte Albán and the Classic Veracruz site El Tajín.
12.Ravenna
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The image is of the Basilica of San Vitale. The other images are of the peristyle of Diocletian's Palace in Split, the Roman temple Maison Carrée in Nîmes and the Sanctuary of the Madonna of San Luca in Bologna.
13.Kyoto
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The photos is of the Zen Buddhist temple Kinkaku-ji. The other images are of the Buddhist temple Tōdai-ji in Nara, the torii of the Shinto shrine on the island of Itsukushima and the Great Buddha at the Buddhist temple Kōtoku-in in Kamakura.
14.Zanzibar
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The photo depicts the city's Sultan's Palace. The other photos are of Elmina Castle in Elmina (Ghana), the Church of Saint Andrew in Tangier and the Grand Mosque of Dakar.
15.Kiev
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The building is the monastery Kyiv Pechersk Lavra. The others are the Hungarian Parliament Building in Budapest, the Alexander Nevsky Cathedral in Sofia and Saint Isaac's Cathedral in Saint Petersburg.