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Global VLBI imaging at millimeter and sub-millimeter wavelength overcomes theopacity barrier of synchrotron self-absorption in AGN and opens the direct viewinto sub-pc scale regions not accessible before. Since AGN variability is morepronounced at short millimeter wavelength, mm-VLBI can reveal structuralchanges in very early stages after outbursts. When combined with observationsat longer wavelength, global 3mm and 1mm VLBI adds very detailed information.This helps to determine fundamental physical properties at the jet base, and inthe vicinity of super-massive black holes at the center of AGN. Here we presentnew results from multi-frequency mm-VLBI imaging of OJ287 during a majoroutburst. We also report on a successful 1.3mm VLBI experiment with the APEXtelescope in Chile. This observation sets a new record in angular resolution.It also opens the path towards future mm-VLBI with ALMA, which aims at themapping of the black hole event horizon in nearby galaxies, and the study ofthe roots of jets in AGN.

Zooming towards the Event Horizon - mm-VLBI today and tomorrow