When the Large Hadron Collider was completed in 2008, everyone thought that a fissure would occur in the Earth and half of Europe would fall into the hole which remained (I remember sitting and waiting to hear a rumble).
OBVIOUSLY this didn't happen, and it was total hype. CERN used this collider to record proton-proton collisions.
Though this collider is already called the LHC (Large Hadron Collider), CERN are planning on building another even bigger collider, which will be 3x the size of the current one lying under Geneva! This new collider will have a circumference of 50miles (which dwarfs the Geneva one by a gigantic 33miles!!). This new collider would be used to discover how gravity interacts at the level of molecules. Ooh how exciting!
Explorer Fact: Fear not! The collider would not be built until at least until 2025.