Fiction:
Anything by Richard Russo is great.
Sacred Games - Vikram Chandra - Ganesh Gaitonde is one of the best fictional gangster characters in the history of fiction.
Non-Fiction:
1491 - Charles Mann. A lot of his theories about the pre-Columbian Western Hemisphere are mainstream now, but were groundbreaking when he wrote this book.
The Warburgs - Ron Chernow - A book about one of the most important banking families in history that also is a story about the growth of anti-Semitism in Germany that led to Hitler.
The Birth of Plenty: How the Prosperity of the Modern World was Created - William Bernstein
A Splendid Exchange: How Trade Shaped the World from Prehistory to Today - William Bernstein
Bernstein doesn't get everything right, but if you want to read just two books that explain why the world is the way it is, these are the two.