Nikola Tesla, one of the greatest inventors of all time with over 100 patents and 700 inventions was popular due tto his invention of the Tesla coil. Which by the way I regard as his best invention.
There are other inventions which are mind blowing, some of which are:
Radio and Remote Control
Adams power plant transformer house
This list happens to carry the most popular inventions by Nikola Tesla , however there are some of his inventions that was not actualized.
Nikola Tesla Patented the Earthquake Machine but never built it, he also patented some other amazing inventions like thought Camera, wireless energy, artificial tidal wave, electric powered supersonic airship, and death beam.
Personally to me, despite all his other inventions, the Tesla Coil Stands out to me. So I think that's his most awesome invention.