What did Nikola Tesla do in Colorado Springs?

Tesla, a local contractor, and several assistants commenced the construction of the laboratory shortly after arriving in Colorado Springs. According to accounts, Tesla used it to transmit tens of thousands of watts of power wirelessly; it could generate millions of volts of electricity and produce lightning bolts more than one-hundred feet (30 m) long. Tesla posted a large fence around it with a sign "Keep Out - Great Danger". The lab was established on Knob Hill.