A map with a large house in which there are 5 NPCs and 6 chests with various useful supplies. Plus there is a rather deep tunnel at the end of which there is a small structure. And already in it a teleport is installed with which you can get to other small autonomous structures underground.
And according to the author, there are secret doors.
Screenshots
Or a modern house
If I find something I will add
Why does it say it's impossible to open it?
I checked that the map of norms is being downloaded and transferred to Terraria. In Terraria, it starts and works without problems. Do you get a message about the inability to open in the game or while downloading?
I think your terraria is an old version that's why you can't open it
Psp
Maybe a classic?
I'll add tonight if the card converts.
Added classic