What's one memorable place you've been or one unusual thing you've done below ground level — in a cave, tunnel, subway, or basement?

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Fungirlmmm · 51-55, F Best Comment

I went inside tombs in Israel. I camped inside caves in Tennessee.

Fungirlmmm · 51-55, F

@Fungirlmmm and I've been through Rock City and some other stuff in Europe mostly.