It's a temporary adventure hut.

Quite like in every quest location that is not secured by a fort, there is the chance of meeting big players there who might kill you quickly.

If you have a decent army that you can watch over for the time that you spent there and you can be there quickly (They stay in one place for 36h.) it can be very interesting to go there.
If any of these conditions is not met, I'd avoid it ...