An '*' means one I highly recommend.
Books by Michio Kaku:
Beyond Einstein: The Cosmic Quest for the Theory of the Universe (A little technical for beginners but a good overview of the history of String Theory)
Hyperspace: A Scientific Odyssey through Parallel Universes, Time Warps, and the Tenth Dimension* (A must read. Period.)
Einstein's Cosmos: How Albert Einstein's Vision Transformed our Understand of Space and Time
Parallel Worlds: A Journey Through Creation, Higher Dimensions, and the Future of the Cosmos* ( A great book about Quantum Cosmology and M-Theory)
Physics of the Impossible: A Scientific Exploration Into the World of Phasers, Force Fields, Teleportation, and Time Travel* (Another must read, especially in the later half of the book)
Books by Brian Greene:
The Elegant Universe: Superstrings, Hidden Dimensions, and the Quest for the Ultimate Theory* (Very similar to Hyperspace. Really good)
The Fabric of the Cosmos: Space, Time, and the Texture of Reality* (Discusses the nature of space-time from a relativistic and a quantum mechanical perspective)
The Hidden Reality: Parallel Universes and the Deep Laws of the Cosmos* (Everything multiverse is in this book)
Books by Stephen Hawking:
A Brief History of Time: From the Big Bang to Black Holes* ( A must read)
The Universe in a Nutshell*
The Grand Design* (A great book on how the universe could have came from nothing)
Books by Leonard Susskind:
The Cosmic Landscape: String Theory and the Illusion of Intelligent Design
The Black Hole War: My Battle with Stephen Hawking to Make the World Safe for Quantum Mechanics*
Books by Lawrence Krauss:
A Universe from Nothing: Why there is Something rather than Nothing* ( A must read if you're interested in the history of Cosmology and what Quantum Mechanics says about what possibly could have happened before the Big Bang)
Also:
Horizons: Exploring the Universe* ( College textbook. An introduction to Astrophysics) Horizons: Exploring the Universe, (0495559733), Michael A. Seeds, Textbooks - Barnes & Noble
Your Cosmic Context* ( College textbook. And introduction to Cosmology) Your Cosmic Context: Introduction to Modern Cosmology, (0132400103), Todd Duncan, Textbooks - Barnes & Noble
Universe: The Definitve Visual Guide* (A really good overview of Astronomy. It’s full of star charts and thousands of beautiful color pics and illustrations) BARNES & NOBLE | Universe: The Definitive Visual Guide by Martin Rees, DK Publishing, Inc. | Paperback
The 4% Universe: Dark Matter, Dark Energy, and the Race to Discover the Rest of Reality by Richard Panek
Death by Black Hole: And Other Cosmic Quandaries byNeil deGrasse Tyson* ( A great book)