To this date, the existence and locations of high-energy neutrino sources in our Galaxy are a big mystery. Their identification would be a smoking gun signature for a hadronic cosmic-ray accelerator, providing vital information to shed light on the origin of Galactic cosmic rays and the properties of Galactic PeVatrons. High-energy gamma rays and neutrinos can both be produced by the decay of mesons that are created in inelastic collisions of cosmic rays and the interstellar gas. This correlation would also allow us to decipher the fraction of gamma rays produced by electrons. In this contribution, we will introduce and discuss the most promising supernova remnants and molecular gas clouds to hunt for Galactic neutrino sources and PeVatrons. We will introduce our novel 3D modelling of cosmic rays escaping supernova remnants to interact with nearby molecular gas clouds. We will discuss how we determine the most promising targets to be detected by the IceCube Neutrino Observatory and the Cherenkov Telescope Array, and how these targets vary under a range of system parameters, such as the gas and supernova remnant properties.