Loaded a scene from assets while working on my own, now i can't figure out how to get back to mine....

I was working on some terrain, and i opened up EasyRoads3D and was trying to figure out how to use it and i double clicked on a "test scene" in the assets folder and it opened up but now all my stuff disappeared... I didn't save it and i quit Unity and when i came back in it was on the same thing... how do i get my stuff back...