  Artificial lattices provide a tunable platform to realize exotic quantum
devices. A well-known example is artificial graphene (AG), in which electrons
are confined in honeycomb lattices and behave as massless Dirac fermions.
Recently, AG systems have been constructed by manipulating molecules using
scanning tunnelling microscope tips, but the nanoscale size typical for these
constructed systems are impossible for practical device applications and
insufficient for direct investigation of the electronic structures using
angle-resolved photoemission spectroscopy (ARPES). Here, we demonstrate the
synthesis of macroscopic AG by self-assembly of C$_{60}$ molecules on metal
surfaces. Our theoretical calculations and ARPES measurements directly confirm
the existence of Dirac cones at the $K$ ($K^\prime$) points of the Brillouin
zone (BZ), in analogy to natural graphene. These results will stimulate ongoing
efforts to explore the exotic properties in artificial lattices and provide an
important step forward in the realization of novel molecular quantum devices.
