In this paper we present the PL-LAB, which is a Polish nationwide network test bed involving several research and academia institutions. PL-LAB was designed to facilitate research in the area of Future Internet carried out within the Future Internet Engineering (FIE) project. It allows researchers to create virtual laboratories, with guaranteed resources and direct physical access to laboratory equipment. This way, PL-LAB enables running, among others, experiments that deal with virtualization, which is the base concept for the FIE proposal of Future Internet architecture.