I consider both of these machines works of art in their own right.
The Large Hadron Collider at CERN:
Over 17 miles in circumference and buried under the border of France and Switzerland, the LHC is the world’s largest and most powerful particle accelerator. Liquid helium cooled superconducting magnets focus and keep the hadron (heavy ion or proton) beams on their track through a series of systems which increase their energy to a peak of 7 TeV. There are six detectors at the LHC.
Tesla’s Egg of Columbus:
Created by Tesla for the 1883 World’s Fair in Paris, this display demonstrates a rotating magnetic field.