What is inside a Black Hole (BH) horizon $r_*=2GM$? We discuss two non-singular BH solutions, BH.fv and BH.u., within General Relativity, which look like a singular Schwarzschild BH from the outside. BH.fv corresponds to a false vacuum energy excess $\Delta = 3r_*^{-2}/8\pi G$, while BH.u also has matter and radiation expanding inside. For the inside comoving observer this BH.u solution looks like an homogeneous and isotropic universe with $\Lambda=3/r_*^2$. For an outside observer our Universe looks like a regular BH with $M \simeq 5.8 \times 10^{22} M_{\odot}$. Thus, the Big Bang model is an illusion of the comoving observer and could be inside a much older and larger universe. Primordial inflation, the measured cosmic acceleration, CMB anomalies and tensions in measurements of cosmological parameters all provide independent observational support for such BH.u solution.