<p>National Geographic's <a href="http://travel.nationalgeographic.com/travel/sustainable" target="_blank">Center for Sustainable Destinations</a> works to protect the world's distinctive places through wisely managed tourism and enlightened destination stewardship. Here are its 13 geotourism principles for governments and tourism operators.</p><p>1. Enhance the geographical character of the destination by developing and improving it in ways distinctive to the locale. Encourage market differentiation and cultural pride in ways that are reflective of natural and cultural heritage.</p><p>Above, deer roam outside Eremitage Palace in Dyrehaven, Denmark.</p>