Ключевые слова: algarve, america, ancient, arecibo, attraction, business, camuy, caribbean, cave, cavern, challenge, cliff, cueva, dark, dead, end, escape, exit, famous, finish, gate, geology, hole, labyrinth, landmark, landscape, light, lost, maze, nature, problem, puerto rico, risk, rock, scenic, solution, stalactite, stalagmite, stone, success, survive, tourism, trap, travel, tunnel, underground, usa, ventana, window,