This picture shows a cross section of part of the LHC. Those two yellow lines sticking out are the actual tubes. Everything else is equipment to manage the particles (detectors, containment, magnetic propulsion).

And for a sense of scale, a human can comfortably stand in that tunnel next to it.

Image: http://www.tut.fi/cs/groups/public_news/@l102/@news/@p/docum... From here: http://www.tut.fi/en/about-tut/news-and-events/tut-and-cern-...

Most of that is the magnets around the beam tube, with the associated power and refrigeration equipment. The beam tube itself is quite small.

Those are the detectors. And the magnets around the tubes.