I know we are all focussing on the LHC at the moment, but take a moment to marvel at the Large Helical Device. Built to "conduct fusion-plasma confinement research in a steady-state machine and to elucidate important research issues in physics and engineering for helical plasma reactors." Source.

Link to a really large image of it.

Related posts:

1. Job Opportunity
2. Honda’s assisted walking device
3. A very large diesel engine
4. Has the Large Hadron Collider Destroyed the World Yet?