The theme of the XXXIV International Meeting on Fundamental
Physics held in El Escorial, Spain on April 2-7, 2006 was "From HERA and the
TEVATRON to the LHC."  This is a summary of the four lectures I presented on
"Physics at the Tevatron."  Heavy quark production and the production of
photons, bosons, and jets at the Tevatron were discussed.  Also, a detailed
study at the "underlying event" at CDF is presented together with a
discussion of PYTHIA 6.2 tunes.  A look back at the "old days" of
Feynman-Field collider phenomenology is included.