value can vary,
land up itself can go for as little as a couple thousand to many thousands
depending on location, views, etc...
as for the cabin it be worth nothing or many thousands,
as comparison a small log cabin can be built for as little as $10K
or can cost +$50K
without knowing details would sya on the lowend would be worth $10K-$20K
on the high end $20K-$50K,
hard to tell without seeing pics or knowing the lot