Underground Chambers 2.3 is a release file of the Minecraft map Harry Potter in Minecraft - Underground Chambers, made for Minecraft 1.11.2. It was published on May 4, 2017 and is 3.8 MB in size. For the full description, screenshots and every other version, visit the Harry Potter in Minecraft - Underground Chambers map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.