Spain is a wonderful destination not only for the fan of history, but the fan of the incredible outdoors. One of the strangest features of Spain is Playa de Gulpiyuri, a sandy beach situated in a meadow in the Spanish countryside. This beach isn't a traditional meeting of land and sea, but actually a flooded sinkhole. Underground caves and streams supply water to the "beach," and the air pressure and forces within the underground caves even simulate the forces of tidal waves on this interior water feature. If you want both the rolling countryside and a trip to the beach, treat yourself to this charming meadow.