A growing body of observational and theoretical evidence suggests that fractal geometry is not an anomaly but a recurring structural principle across the Universe, manifesting consistently from cosmological scales to quantum phenomena. Large-scale galaxy distributions, dark matter clustering, interstellar media, turbulent flows, biological networks, and quantum paths all exhibit scale-invariant, hierarchical organization characterized by non-integer fractal dimensions. In this work, we present a comprehensive, multi-scale analysis of fractal structures in nature and demonstrate that a critical Hausdorff dimension in the range D≈2.6-2.8, with a pronounced convergence near D≈2.7, emerges repeatedly across disparate physical systems. We argue that this convergence is not coincidental but reflects a fundamental geometric balance between localization and delocalization, enabling stable structures, long-range interactions, and temporal evolution. Interpreting these findings within the Unified Fractal Quantum Field Theory (UFQFT) framework, we propose that spacetime itself possesses an intrinsic fractal architecture, with matter, dark matter, and dark energy corresponding to distinct resonance regimes of unified energy-charge fields embedded in this geometry. The value D≈2.7 is identified as a critical threshold at which particle stability, confinement, propagating fields, and the arrow of time coexist. This perspective offers a unifying geometric interpretation of structures and dynamics across physical scales and provides concrete, testable predictions for cosmology, particle physics, and quantum phenomena.