If your trip to Harlem is all booked but your itinerary is looking a bit empty, let us give you a helping hand.Apollo Theater and Columbia University are some excellent sights that are easy to reach from this neighborhood. Whether you take a tour or experience them at your own pace, it's bound to be a memorable day.There are a range of sights within easy reach of the middle of this neighborhood, such as Cathedral of St. John the Divine. More adventure awaits at Black Gay & Lesbian Archive and Harlem YMCA, which are also close at hand.