The infamous giant "Footprint of God" in South Africa. It is approximately 5' tall, and it's embedded in granite! Went and saw Michael Tellinger speak - one of the most fascinating lectures I've witnessed.
Tuskegee Syphilis Experiment (1933) When asked why they had to receive several "back shots"(spinal taps), researchers repeatedly lied to the men, claiming theshots were ."therapeutic" when in fact the spinal taps gaveinsight to infection from the spinal canal into the brain.I think there is a book about it called: The immortal Life of Hennrietta Lack, she being one of the first.