You've lucked out, readers.
I planned on only posting geomorphs once a week from now on (Mapping Mondays!) but forgot to change the posting date/time when I did Geomorph B4 yesterday. So, you get an extra geomorph today: a gate made of two large doors, 20' across, barred shut by a giant log. The central room is a pillared hall with one other exit; there are also two other secret rooms unconnected to the pillared hall.
I may actually post some border/corner geomorphs this week as well, but I'm saving the next 10x10 geomorph for next Monday.