Ok so I ended up being busier than I expected and wasn't able to get media for you, but I took down some spots.
There's a 45-60 ft flat down and a 50 ft down rail inside Harvard Stadium. They both have perfect run ups and look perfect, but the problem is the stadium is locked. You could easily climb over the wall because it's only like 3-4 ft high, but you might have an issue if you're using a generator/light setup.
Over near the Harvard Parking garage a ways down from Harvard Yard/Square is a HUGE C-Rail Drop Rail. Each section is about 2.5 ft long with a big mellow curve to the whole rail. It has a small run up due to the road, but if you hit it around 2-4 am cars shouldn't be an issue. I DO have a photo of this from a high angle, but I'll post so you can get an idea.
There's also a ton of Up-Flat rails of the back of building's for loading docks that look pretty mellow.