<p>The vertiginous "infinity pool" at the Marina Bay Sands resort offers a sweeping view of <a href="http://travel.nationalgeographic.com/travel/countries/singapore-guide/">Singapore</a>, a country that's achieved success while building up instead of out.</p> <p><i>See more <a href="http://ngm.nationalgeographic.com/2011/12/city-solutions/city-solutions-photography">pictures</a> from the December 2011 feature <a href="http://ngm.nationalgeographic.com/2011/12/city-solutions/kunzig-text">story</a>, "The City Solution."</i></p>