But in the intervening millennia, humans have created plenty of other awesome attractions, from which we have drawn a must-see list of our own. See sagradafamilia.org/en16 Blue Mosque, Istanbul, TurkeyThe Blue Mosque, or Sultan Ahmed Mosque, ranks as one of Istanbul’s three most-visited attractions. See sydneyoperahouse.com10 Colosseum, Rome, ItalyThe Colosseum connects visitors with ancient Rome in a way that old temples and palaces don’t. And if you do step inside, the Colosseum puts you in touch with ancient Rome in a way that all those old temples and palaces don’t. Every building is covered with tiles glazed in astonishing shades of blue, from azure to cobalt, cerulean to turquoise.