A survey of the most recent developments in general relativity and in the theory of the unification of Fundamental Interactions is presented in this book. The theoretical results, the cosmological and astrophysical aspects, the experimental and observational programs are shown in 26 general talks by renowned scientists active in this field.A survey of the most recent developments in general relativity and in the theory of the unification of Fundamental Interactions is presented in this book. The theoretical results, the cosmological and astrophysical aspects, the experimental and observational programs are shown in 26 general talks by renowned scientists active in this field.In Memory of Ruggiero de Ritis.- The Lectures.- Radiative Spacetimes.- Instantons and Scattering.- The Early Universe, the Present Universe.- 2D Dynamical Triangulations and the Weil-Petersson Measure.- N?ther Conserved Quantities and Entropy in General Relativity.- Spinors, Supergravity and the Signature of Space-Time.- VIRGO: An Interferometric Detector of Gravitational Waves.- Oscillation and Instabilities of Relativistic Stars.- Active Galactic Nuclei and the Properties of Supermassive Black Holes.- Huygens Principle and MAPLEs NPspinor Package.- Hamiltonian Structure of 2+1 Dimensional Gravity.- Covariant Quantum Mechanics and Quantum Symmetries.- Anti-de Sitter Quantum Field Theory and the AdS-CFT Correspondence.- Geodetic Contributions to Gravitational Experiments in Space.- The r-modes Oscillations and Instability: Surprises from Magnetized Neutron Stars.- Strong Field Gravity and Quasi-Periodic Oscillations from Low-Mass X-ray Binaries.- What Have We learned about Gamma Ray Bursts from Afterglows?.- Gravitational Waves and the Death-Spiral of Compact Binaries.- Gravity in Anti-de-Sitter Space and Quantum Field Theory.- Black Hole Formation in Supernovae: Prospects of Unveiling Fallback Emission.- Advanced Readout Configurations for the Gravitational Wave Detector AURIGA.- Classical Relă(