Answer:
Large Hadron Collider
Step-by-step explanation:
My favorite is the Large Hadron Collider. It is 16.6 miles and a new version is expected to be built that is 62 miles long. It is incredibly interesting to me how they are able to separate individual atoms and make them travel through the collider at light speed and then smash them into each other at these speeds. What's even more interesting is that on November 7 of 2010 they managed to create a mini-big bang that created temperatures a million times hotter than at the center of the Sun.