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 an false vacuum $\Delta = 3R_*^{-2}/8\pi G$, while BH.u also has expanding or contracting matter and radiation 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 much older than previously estimated. 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.