Pertinent here I think - some pictures of the Tesla monument at Niagara Falls, taken during our recent vacation visit to Canada.
The associated plaque rather nicely simply records what was probably his most significant idea, the three-phase induction motor.
It was interesting that the original Niagara Falls polyphase installation had two-phase alternators, with Scott transformers to convert to three-phase for transmission, apparently because the effects of unbalanced phase loading on three-phase alternators had not been worked out at the time.
Cheers,