https://motherboard.vice.com/en_us/article/439kan/cerns-new-collider-design-is-four-times-larger-than-the-lhc

The 2012 discovery of the Higgs boson particle at CERN’s Large Hadron Collider (LHC) is widely considered to be one of the most important scientific breakthroughs in history. It validated a half-century of research about the basic building blocks of matter, and remains the crowning achievement of modern particle physics.

Now, CERN wants to follow up on the LHC’s smashing success with a super-sized structure called the Future Circular Collider (FCC). This next-generation particle accelerator would boast 10 times the observational power of the LHC and would stretch across 100 kilometers (62 miles), encircling the Swiss city of Geneva and much of the surrounding area.