I agree Fetal Surgery is pretty amazing.
There are a couple places in the country that are doing Fetal Cardiac Intervention for babies with hypoplastic left heart syndrome. I believe Boston Children's and CHOP are the only 2 centers actively doing these procedures. The procedures are in-utero aortic valve enlargements which are performed by ultrasound guided needle balloon dilation. Also, people are currently researching open fetal heart surgery, in which the fetus is actually placed on bypass (heart lung machine) so that the fetal heart can be repaired in a bloodless field. I believe Stanford attempted the only known case back in the early 2000's but it has not been followed up at any other center yet.
I believe Cincinnati Children's now offers a Fetal Surgery Fellowship, but it requires that you have at least completed your general surgery training and are board certified. Also Dr. Harrison at UCSF (considered the father of fetal surgery), is still there and I think they have a training program there also.