Terahertz and multi-terahertz microscopy with subwavelength spatial resolution has recently progressed from proof-of-principle demonstrations to scientific studies capable of revealing unique information. For example, the ability of terahertz nanoscopy to combine spatial resolution on the nanometer (or even sub-nanometer) scale with ultrafast temporal resolution may ultimately make it a 'killer application' for terahertz technology--one that can address scientific questions that are inaccessible via any other experimental approach. It may even be possible to obtain a comprehensive picture of nanoscale dynamics by combining cutting-edge terahertz-based techniques like near-field scanning optical microscopy and lightwave-driven scanning tunneling microscopy. Still, technical challenges remain that must be solved before the full potential of these techniques can be realized, either individually or together. In this symposium, we will discuss the latest results and future prospects of terahertz nanoscopy, as well as scientific goals for the field.