As the saying goes, "X marks the spot." This unusually shaped lake, Lake Cisco, was created in the early 1920s in an effort to create a source of water for Cisco and the other nearby towns. For reasons lost to the ravages of time, a large pool was built inside the dam along with a skating rink, a small zoo, and an amusement park. At the time, the pool was billed as the largest concrete pool in the world (though its actual dimensions are unknown). The hollow dam was unfortunately closed the public in the 1970s, and vandals burned the skating rink. The smoke also irreparably damaged other parts of the interior, too, preventing any possibility of reopening the interior in the future.