Sewers. Not a nice place to start the adventure, but a good DM can think of a whole lot of great traps and opponents who will appear and surprise players.
We've found that sewers should be prepared as tiles because the team should have the opportunity to explore large underground space.


Sewage is also dirty, muddy water, smell, animals and monsters living there. In other words - a great opportunity to experience an interesting adventure.
As in the previous tiles collection (Dungeon Tiles), you can use ready assets such as barrels, chains, cracks, sludge, water etc. (download here)


BTW - we once created tiles with tunnels and you can download them for free here
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