At 3.32 a.m. on 6th April 2009, the main shock of L’Aquila earthquake travelled through the soil, and INGV recorded a seismic sequence in Rome, in underlying soil and Colosseum. Since 2000 years, the soil transmits all the vibrations to the monument, by ambient vibrations too. The analytical tolerance attained by models of Structural Engineering are: a) fine (5%) for allowable stresses method of reinforced con-crete structures (r.c.); b) rough for monuments, with elevation fixed at the basis, all interactions are stopped and the soil is missing. We propose a new methodology collecting three models by Geophysics, Structural and Transportation Engineerings. For trains, a multibody model reproduces Metro B and C, and a 600x600x80m soil clod is enclosed. From the year 2000, the PC allowed the analysis with 500,000 d.o.f., and a DISS Group grown up between Italian Universities, ENEA, INGV, SSBA of Rome, SDR of Tokyo, producing three Int. Workshops. For Colosseum, we were exceptionally lucky for three reasons: 1) the tests in 200 points (never used before) were at disposal, 2) 50,000 man hours were spent with pure scientific interest, without time deadline, 3) we successed in identifying the map of 350 elasticity modules by comparison between tests and analyses, approaching local tolerances similar to r.c. The structural preservation of Colosseum may be obtained only by an analytical model simulating the real behaviour with accuracy. The feasibility was demonstrated by linear dynamic analyses performed for the aforemen-tioned actions. The final objective is to bring to perfection the proposed methodology up a small toler-ance everywhere, by tests and analyses for: a) Constantine Arch, cryptoportici and tunnels of Metro B and C; b) improvement of geometric and mechanical characteristics of foundations and soil; c) trains’ models with rubber wheels or Magnetic Levitation skates to reduce monuments vibrations; d) the map of damping coefficients.