The Doors

First book, don't have to read it, just wanted to put it somewhere to maybe get some feedback.

After the great disaster humanity was but a fragile shell of what it once was, the once tall skyscrapers, the buildings that stood so firmly, were now mountains of rubble. The oceans that were full of life and color, now just a barren wasteland devoid of all things good and beautiful. The forests once teeming with life, now all burnt and reduced to ashes. The only hope humanity had left were the Doors; mysterious and dangerous with worlds behind each one. Yet this seemed to be the only choice humanity had left, and I was one of the chosen few to be sent searching for humanities last hope.