Metamaterials are artificial structures that provide a custom-designed environment for light beyond the properties of natural materials. Metamaterials are traditionally based on isolated structures that are made of plasmonic metals and arranged on a sub-wavelength lattice. In our group, we investigate the fundamental physics of network-like metamaterials, which consist of one or more percolating plasmonic domains rather than isolated metallic objects. We are particularly interested in the peculiar bulk modes that some of these network-like plasmonic morphologies provide. While our research is mainly driven by fundamental theoretical insight, we also work on the fabrication of metallic networks on different length-scales, and their experimental characterization.