Destinations is Valve's new VR content creation package that will allow users to create and explore VR worlds.
Now available in Early Access, it enables the creation of explorable VR worlds made via photogrammetry, game levels, and more. Destinations is offered free of charge and comes with documentation, sample worlds, plus access to the Source 2 technology and developer Wiki.

Valve has also set up a dedicated Destinations Workshop for users to share their creations with the world. You can download Destinations for free through Steam.