We discuss the physics opportunities and detector challenges at future hadron
colliders. As guidelines for energies and luminosities we use the proposed
luminosity and/or energy upgrade of the LHC (SLHC), and the Fermilab design of
a Very Large Hadron Collider (VLHC). We illustrate the physics capabilities of
future hadron colliders for a variety of new physics scenarios (supersymmetry,
strong electroweak symmetry breaking, new gauge bosons, compositeness and extra
dimensions). We also investigate the prospects of doing precision Higgs physics
studies at such a machine, and list selected Standard Model physics rates.