Allow us to craft a manmade version of a burrow/den.
The entrance can be clay/dirt/bricks or whatever and require digging out with a pickaxe the same way a basement would.
The idea is that the entrance takes up a small amount of tile realestate like a burrow, 3x3 max.
Inside could be as big as a timber house cellar, 9x6, and share the same visuals of the inside of a den.
The kicker would be that this is the only place in the game that allows for the creation of MEAT STOCKPILES.
It could also have a very extended decay rate for snow, ice blocks, corpses and other similar decaying things. Even moreso than a regular basement.
Obviously meat stockpiles should not be able to get lifted by wheelbarrows.