These questions can easily be answered by yourself using Wikipedia.This is my help from Washington, D.C. United States of America. Please pick an answer as the best answer, even if it is not mine.
Castle Clinton is in New York State (specifically New York City)Fort Sumter is in South Carolina (specifically Charleston harbor)Governors Island is in New York State (specifically New York City)
All of these monuments are administered by the National Parks Service. You can find everything you want to know about them here: www.nps.gov
THIS HAS ABSOLUTELY NOTHING TO DO WITH WASHINGTON, D.C. FIND THE CORRECT SECTION AND ASK YOUR QUESTION THERE!!!!!