Newcastle Castle is a cool spot in the heart of Newcastle upon Tyne where you can explore a medieval fortress that's been around for nearly 2000 years. With two main buildings, the Castle Keep and Black Gate, you can wander through history and check out all four floors of this ancient monument. While the Black Gate is fully accessible, the Castle Keep has some steep stairs and uneven surfaces, so be prepared for a bit of a workout! Don't forget to stop by the gift shop on your way out for some castle-themed souvenirs.