In order to characterize the innermost regions of planet-forming disks, we require instrumentation with high spectral resolution, high spatial resolution, and high sensitivity. Today's state-of-the-art instruments (e.g., CRIRES+, GRAVITY, JWST-MIRI) now/will offer these capabilities, but the real opportunity lies in combining instruments with different strengths. In this talk, I will focus on what we have learned about protoplanetary disks from such instruments in the past, provide an example

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... current work, and discuss the future opportunities that can come from combining CRIRES+, GRAVITY(+), and JWST-MIRI observations. Together, these instruments can shed light on the dust and gas structure and the chemical abundances in the terrestrial planet-forming regions in a way that would be very difficult or impossible using only one instrument or method.