Biggest hill you have gone down

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Whats the biggest hill you gone down?

Whats the biggest hill you gone down?
I'd estimate about 70-90 feet tall... This area is pretty much flat... the only hills that have any size to them used to be landfills that got covered with dirt then turned into parks...

Whats the biggest hill you gone down?
The back side of Kinsmans Notch near Littleton NH, I think. It's about 2.5 miles at about 12% grade. The best I've ever done is about 55 MPH, but several companions have exceeded 60 MPH.