Peruse the large variety of books and other resources at Boris Yeltsin Presidential Library. It's bound to open your mind to the wonders of the world we live in.
When you've spent a bit of time at this collection of books in St. Petersburg City Centre, why not check out State Hermitage Museum and Winter Palace, Church of the Savior on Spilled Blood, and Russian Museum? They're not too far from Boris Yeltsin Presidential Library and also a hit with tourists.