To see in a cave you have to bring your own lights in or go to a cave where people go on guide tours like Bridal Cave. Caves are dark but that does not make them bad just different from what you are used too. Caves are dark, just like lakes are wet and mountains are high. Imagine what it would be like if you lived all your life in a cave and that is what seems normal to you. If you saw sunlight you might actually be scared of it because you would not know what it was.
Caves are usually wet because water seeps through the cave roof and falls on the floor and walls.
That does not make the cave scary either. Some people do not like caves because they think that caves are cold. Actually, most caves in Missouri are around 55 degrees all year round which feels cool if you visit them in the warm summertime. On the other hand, caves feel nice and warm if you go inside one on a cold winter day. The only thing scary about caves is when kids go wild cave exploring without grown-ups and the proper equipment.