Kramerbooks & Afterwords Cafe
1517 Connecticut Ave., NWWhat it is: A bookstore that has a bar and restaurant inside.
Why it's innovative: When it opened in 1976, Kramerbooks & Afterwords Cafe was the first bookstore/cafe in the country to feature cappuccino, espresso, a full bar and food. Now, it's one of the most popular D.C. hangouts — especially since it's one of the few venues in D.C. that's open 24 hours on Friday and Saturday. It serves breakfast, lunch, and dinner, and brunch on the weekends.