  In this contribution we summarize the highlights from the Pierre Auger
Observatory presented at the 35th International Cosmic Ray Conference. We
discuss the update of the measurement of the energy spectrum of cosmic rays
over a wide range of energy ($10^{17.5}$ to above $10^{20}$ eV), studies of the
cosmic-ray mass composition with the fluorescence and surface detector of the
Observatory, the discovery of a large-scale anisotropy in the arrival direction
of cosmic rays above $8\times 10^{18}$ eV and indications of anisotropy at
intermediate angular scales above $4 \times 10^{19}$ eV. Moreover, we report on
tests of hadronic interactions beyond LHC energies, multi-messenger analyses
with neutral primaries and the progress of the upgrade of the Observatory,
AugerPrime, aimed at elucidating the origin of the observed flux suppression at
ultra-high energies.
