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The Nanophotonics Lab at PSU was active 2003-2023 and was used to study photonic processes in nanostructures using ultrafast photoemission microscopy. The goal was to observe optical processes on the nanometer scale with femtosecond time resolution. In collaboration with Prof. G. Rempfer we first built an aberration-corrected photoemission electron microscope and subsequently used this unique home-built instrument to directly visualize light propagation at solid interfaces and surfaces. We were mainly interested in studying processes such as energy transfer and conversion, electron emission, surface plasmon propagation and other interactions. We applied the gained knowledge also to design, make and study new devices, such as novel solar cells, light emitting diodes, random lasers as well as plasmonic energy converters and plasmonic sensors.