How was the double-slit experiment proved?
In proving lights wave-particular duality. Was this replicated by anyone?
That article also covers many variations of the experiment, and the many ways to interpret the results.
It's replicated every year by thousands of undergraduates in university laboratories. Part of the standard education for anyone studying physics, I managed to replicate it myself back in my uni days, and I really wasn't very good at that practical lab stuff.