There's a bit of both! There's modular pieces that let you put together rooms (the images showing interiors, caves, etc, are using modular pieces) so you can customize how those areas look. There are also pre-built buildings which you can plop down in your map (like the houses show in the images). There are no pre-built towns or anything. If you want to get a bit of a better idea of how these assets work, there is a video in the Doomsday assets which shows a time lapse of how I built a scene. Hopefully that will help! This pack can be completely mixed and matched with all of the other packs that have "RPGTools" listed (so Otherworlds, CyberCity, Doomsday, and Northfolk can all be fully mixed and matches - tiles, characters, creatures, icons, etc).