Lisa and I have been driving up the coast of Croatia for several days now. The Roman influence on culture and architecture in Dubrovnik, Split and Zadar has been very impressive. It is now time, however, to head inland for the first time in Croatia to see what I've been told is a natural treasure. We arrive in Plitvice Lakes National Park, one of the waterfall havens of the world. I love UNESCO World Heritage sites, and this made it to the register in 1979.