Yes they are open when it is raining. Bring a sweater or light jacket, that you don't mind being smudged or roughed up by accidentally rubbing against metal stairs and rocks. You should consider splitting your group to do something different if a member is: 1) Clastriphobic 2) afraid of the dark 3) strength for 100 steep steps 4) afraid of heights 5) has vertigo Guidepost.us
Bring a light jacket or sweater, humidity level is not as bad as you would think. Its alot of climbing steeper stairs / ladders. No you are under ground,
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