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1.Ottawa
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Pictured is the Centre Block. The other images are of the Old City Hall in Toronto, Philadelphia City Hall, and Louisville City Hall.
2.Barcelona
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The photo is of the Park Güell, designed by Antoni Gaudí. The other photos depict Madrid, Seville and Valencia.
3.Kuwait City
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The Kuwait Towers can be seen in the centre of the photo. The other photos depict Doha, Manama and Abu Dhabi.
4.Santiago
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The other cities are Lima, Bogotá and La Paz.
5.Christchurch
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The other cities are Hobart, New Orleans and Cape Town.
6.Casablanca
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The Hassan II Mosque can be seen in the picture. The other cities are Algiers, Alexandria and Tel Aviv.
7.Berlin
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The other cities are Frankfurt, Munich and Düsseldorf.
8.Havana
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The building is El Capitolio, in Havana. The other buildings are the National Palace in Santo Domingo, the Texas State Capitol in Austin and the Alberta Legislature Building in Edmonton.
9.Yangon
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Pictured is the Shwedagon Pagoda. The other stupas are Wat Arun in Bangkok, Boudhanath in Kathmandu and Pha That Luang in Vientiane.
10.Kinshasa
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The other cities are Lagos, Addis Ababa and Dar es Salaam.
11.Buenos Aires
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The other obelisks are located in Caracas, São Paulo and Montevideo.
12.Bucharest
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The building in the photo is the Palace of the Parliament. The other buildings are the Government House in Minsk, the White House in Moscow and the National Diet Building in Tokyo.
13.Harbin
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The image is of an ice sculpture at the Harbin International Ice and Snow Sculpture Festival in 2010. The other photos depict Chengdu, Chongqing and the International Conference Center in Dalian.
14.San José
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The stone sphere was made by the Diquis culture, and is located in the courtyard of the National Museum of Costa Rica. This type of carving is the icon of Costa Rica's cultural identity. The sculpted head was created by the Maya, and comes from the ruins of Kaminaljuyu located within Guatemala City. The toad sculptures are part of the ruins of Tenochtitlan in Mexico City, while the wall is part of the El Brujo Archaeological Complex just north of Trujillo.