I visited the Obama Presidential Center, the most expensive presidential library in US history. Here are 15 things that surprised me most.

I visited the Obama Presidential Center during its opening week. It was different from what I expected. Kristine Villarroel/Business Insider The Obama Presidential Center opened in Chicago's South Side this summer. The $850 million center features a roughly 19-acre public campus and an immersive museum. Former US President Barack Obama has the first-ever fully digital presidential library. For over a decade, headlines have been written about the development of former US President Barack Oba...