I don't know of any reason why it wouldn't be.
It's great place to visit
Yes; it is open 24/7, but you should always have a good light available. Even during the day light hours it is dark once you start through.
Yes it's open, make sure to take a flashlight with you, It's more fun.
Yes, it is open during daytime.
Yes, it is always open.
Thanks! Your answer is awaiting moderation.