My 2 favorites are: (1) Tower Descent by Russ Hapke and Dan Wolters. This is a truly awesome map set, one of the coolest maps I've seen on Roll20. I love it & ran 3 campaigns using just this tower. It's a 7 level tower, with the only entrance being on the ROOF. There's no doors or windows on the ground-floor level. That's why it's called Tower DESCENT, it's designed so you start at the top and work-your-way down through the tower. The art has a "forced 3d perspective" that looks fantastic in Roll20. The Aaron gave the link to this set. (2) Dan's Deck Of Instant Towers. This is a Roll20 "Add-On" product, it is a card deck in Roll20. This has many (more than 20?) tower levels. All the levels are the same round tower shape. The levels can be placed in ANY order. Each level is different. There are laboratory, observatory (telescope room), bedroom levels, kitchen level, library, etc. Very easy to use & place on the Roll20 tabletop due to being consistent size. Link to the card deck: <a href="https://marketplace.roll20.net/browse/gameaddon/378/dans-deck-of-instant-towers" rel="nofollow">https://marketplace.roll20.net/browse/gameaddon/378/dans-deck-of-instant-towers</a>