Dalkey N.C., 1968, The Delphi Method: An Experimental Study of Group Opinion, The Rand Corporation, Santa Monica. Di Giovine M. A., 2008, The Heritage-scape: UNESCO, World Heritage and Tourism, Lexington Books, Lanham. Kotler P.A., 1970, Guide to Gathering Expert Estimates: The Treatment of Unscientific Data, Business Horizons, 13 (5), 79 – 87. Rescher N., 1998, Predicting the Future, State University of New York Press, Albany, NY. Surowiecki J., 2004, The Wisdom of Crowds: Why the Many Are Smarter Than the Few and How Collective Wisdom Shapes Business, Economies, Societies and Nations, Anchor Books, New York. Tourtellot J.B., 2006, Places Rated: How do 94 World Heritage destinations stack up? National Geographic Traveler, November–December, 112 – 124. Weaver P.A., Weber K., McCleary K., 2007, Destination Evaluation: The Role of Previous Travel Experience and Trip Characteristics, Journal of Travel Research, 45 (2), 33 3– 344. World‘s Heritage Sites: A Complete Guide to 878 UNESCO World Heritage Sites, 2009, Firefly Books, Buffalo.