Isn't the cave where his daughters got him drunk and had sex with him?
Or am I mixing up my stories?
No, it's the cave right by where he killed the giant, before his hair was cut off after crossing the Red Sea.
(Sorry, couldn't resist.)
Yes and they both bore his children, Moab and Benammi.
http://etext.lib.virginia.edu/etcbin/toccer-new2?id=KjvGene.sgm&images=images/modeng&data=/texts/english/modeng/parsed&tag=public&part=19&division=div1
That's the story, probably the cave. Why are we celebrating incest with a museum?
We don't have to bring up that salacious rumor about Lot and his daughters, hehehe.