A square with a fortress-like building in the middle. In the building, there’s old and grand, but tough, open gate that leads to a set of downward stairs.
The square is filled mostly with adventurers, street vendors selling overpriced stuff, a board with papers pinned on it. The square is surrounded by buildings owned by mercenaries, adventurer guilds, and researchers. (We DO NOT need to have a full view of the square, just dungeon the entrance and the board.)
While the dungeon is a place of death and to be wary of, it also brings a lot of money to the city, and locals don’t want to scare people away from it.
Located in the “Old City Block” (from when City of Tall Hill was just a tiny town, little more than a village)