This experimental app displays OpenStreetMap data (ground tiles, trees, and buildings) in a web-based Virtual Reality environment.
You can use mouse drags to pan around and the W/A/S/D keys to fly through the scene, or switch to VR mode and use the trigger on your controller to teleport around (or the trackpad to fly).
One of the limitations is that currently only a small area gets loaded and no additional scenery will get added when moving around.
The source code can be found as KaiRo-at/vrmap at GitHub.
Map data and imagery of ground tiles © OpenStreetMap contributors, under ODbL/CC-BY-SA licenses.