The US was going to build one 50 miles around. In fact they started in Texas then the plug was pulled. One of the sites offered, had to be on free land, was in northern New York, by the cheap hydro-electricity the US and Canada mutually generate from the dam they built on the St. Lawrence River, giving Chicago, Illinois access to the Atlantic Ocean, but it was stopped quite away along by the US Congress after millions spent. It was called the Superconducting Super-Collider.
Geneva atom smasher sets collision record