When in doubt, we usually vote for being outdoors. But there are places that let us make an exception. These caves, for example. Once entered, you will be confronted with dimensions of time and beauty, that you did not know existed before. Plus, they are spread all over the place, no need to travel far. Limestone caves are great for family adventures and are sure to let your eyes sparkle like the crystals all around, no matter what the weather is like outside.