Explore two of Puerto Rico’s most massive landmarks as you spend 9.5 hours visiting the impressive Cueva Ventana and the world-famous Arecibo Observatory. Window Cave, as it is also known, is a network of caves atop a limestone cliff once only accessible to locals. Admire the elaborate stalactite and stalagmite formations, discover impressive fauna of the caves that eventually lead to panoramic views across the Rio Grande de Arecibo Valley. Then visit the world’s largest radio telescope at Arecibo, a 20-acre (8-hectare) dish used to observe the universe, exploring a range of natural attractions and scientific exhibits on site. Your trip also includes entrance fees, bottled water and round-trip hotel transport.