High pressure is a window to view matter in unusual states. In this talk I will show what neutron scattering is able to contribute to a better understanding of matter under extreme pressures. I will discuss the considerable efforts made recently by various groups to extend the capabilities of high pressure neutron scattering, i.e. to achieve higher pressures and better data quality, and to make it available to a broad scientific community. I will particularly focus on techniques developed in our group, involving the so called “Paris-Edinburgh” pressure cells. These allow sample volumes of up to 100 mm3 and pressures up to 30 GPa, both at low temperatures down to 3.5 K and high temperatures to 2000 K. I will give a few illustrations which will cover structural studies of molecular systems, both at high and low temperatures, disordered as well magnetic systems.