Captions and credits ( up and down, left to right) :
City Hall of San Francisco by Stephen Lam (Reuters)
Angel de la Independencia in Mexico by Tomas Bravo (Reuters)
CN Tour in Toronto by Chris Helgren (Reuters)
Oriental Pearl Tower in Shanghai by Johannes Eisele (AFP/Getty Images)
Sydney Opera House by Cameron Spencer (Getty Images)
Museum of Auckland by Hannah Peters (Getty Images)
One World Trade Center in New York by Daniel Pierce Wright (Getty Images)
Wailing Wall in Jerusalem by Gali Tibbon (AFP)
City Hall of Sydney by William West (AFP)
Bratislava’s Castle by Vladimir Simicek (AFP)
Statue of Christ the Redeemer in Rio de Janeiro by Leo Correa (AP)
Wheel of Brighton by Damien Robert