The Math Book by Clifford A. Pickover

Mathematical inventions and discoveries presented through a historical lense.  From the archaic "Ant Odometer" over 150 million years ago, to the "Mathematical Universe Hypothesis" in 2007, this book covers many of Math's triumphs.

Infinite Powers by Steven Strogatz

Calculus newcomers and experts alike will appreciate this book.  Professor Strogatz lays out the foundations of Calculus and connects this to the world we inhabit.  He makes the case that understanding Calculus allows us to shine a light on the darkest parts of the universe.

Flatland by Edwin A. Abbott

An interesting take on society and its structure, imagining our own heirachries as dimensions of Mathematical spaces.  A great read to ponder and ask yourself where you may reside in Flatland.

Introduction To Graph Theory by Richard J. Trudeau
Linear Algebra Done Right by Sheldon Axler
Understanding Analysis by Stephen Abbott
The Art of Computer Programming, Fundamental Algorithms by Donald Knuth
The Wealth of Nations by Adam Smith
1984 by George Orwell
Animal Farm by George Orwell