Castle Clinton is the official on-site ticket office for ferry service to Liberty Island.
It is strongly recommended to buy tickets online and reserve a time slot.
Be careful with the scams outside.
A few nearby places worth checking next.
I have been using it now for 3 months and it saves me so much research. Reduces the need to call and double check every time.
How did I not know these places existed?! Atly's scoring is a lifesaver, now I can finally find THE spot without wasting time Googling my life away.