The structure of the nucleus and proton at the LHC

A variety of measurements from collisions of large and small systems are sensitive to the spatial configuration of the initial state of those systems. One important example is measurements of anisotropic flow, which carries information regarding the initial state eccentricity. To this end, I will review such measurements from the LHC running periods 1 and 2, and discuss their implications for state of the art initial state calculations. I will also discuss prospects for LHC running period 3, where much larger data samples will be collected, and a greater variety of nuclear species are expected to be collided.