Located at Grotto Bay Beach Resort, the Cathedral Cave contains a bright blue subterranean lake. The water’s a bit chilly, but it’s crystal-clear and up to 30 feet deep in spots. You’ll get a much different perspective of the stalactites and stalagmites from in the water. There’s a viewing platform for taking pictures if you’re not up for a swim. There’s one catch: you need to be a guest of the resort to access the cave. #cave #swimming