Call the National Abortion Federation hotline operators at 1-800-772-9100 where you can go in your area. Or try going to abortions.com and clicking on your state and they will provide a list of abortion clinics.
They are sent to a lab for pathology then disposed of as medical waste, just as a tumor or other removed tissue would be. All clinics in the US are required to track ALL fetal tissue and dispose of...
Surgery abortion is safer because with the abortion pill there is a higher chance of you remaining pregnant. Surgical abortion, as mentioned in the above answer, is as much of an absolute guarantee...