What's wrong with the old firing squad?
Don't you folks that lead is dangerous and can lead to death from lead poisoning. That is why we can bring back the firing squad. However, if we replace the lead bullets with eco-friendly frozen water or steel, that might be satisfactory.
Thanks for posting the Lincoln Assassin gallows photo. The site is on Ft. McNair, in Washington DC. The exact location for the gallows is now covered by the east end of the post tennis court. and the part of the building attached to the wall is now bachelor officer quarters. It was totally renovated (interior) 3-4 years ago.