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We study the most central regions of AGN jets with an angular resolution oftens of micro-arcseconds using VLBI at millimeter wavelengths (mm-VLBI). Wepresent and discuss a new 86 GHz VLBI survey of compact radio sources. We shownew high dynamic range images of two nearby radio galaxies (3C 120 and M87). InM87 the size of the compact VLBI core (the jet base) is < 15 Schwarzschildradii. Future mm-VLBI observations at 1 mm and shorter wavelengths should leadto images of galactic and extragalactic radio sources with a spatial resolutiondown to a few Schwarzschild radii of the central super massive black holes. Toachieve this, the participation of large and sensitive millimeter andsub-millimeter telescopes in VLBI is essential. Owing to their high sensitivityexisting and planned phased interferometers like the IRAM Plateau de Bureinterferometer, CARMA, the SMA and ALMA could play an important role.

How Compact are the Cores of AGN? Sub-Parsec Scale Imaging with VLBI at Millimeter Wavelengths