There is no point in having the most technologically advanced, persistent virtual environment, with full sensory immersion?if you have no content to fill it with.
As a builder, you require specialised tools to make your job as creator of the land, just that little bit easier. Programs designed to visualise, and arrange your creations, turning a mammoth task just a little bit manageable.
ActiveWorlds 4.1: Working with Zones

Zones are new to ActiveWorlds as of version 4.1, released June 2006. They allow litte bubbles of sub-worlds inside the main world, in which the environment itself, can be totally separate from that of the main world, down to the law of gravity itself.