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Construction Span Over 200 Years: Persepolis was a monumental project that spanned over two centuries, initiated in 515 BC under Darius the Great. Despite the extensive period of construction, the city remained unfinished by the time Alexander the Great invaded in 330 BC, showcasing the ambitious scale and vision behind its creation.

Engineering Marvels with Global Influences: The Gate of the Nations and the grand staircase, enhanced with wooden steps, exhibit the influence of Assyrian culture and advanced engineering techniques of the time. These elements highlight the cosmopolitan nature of the empire and its openness to incorporating diverse architectural styles and technologies.

Artistic Depictions of Celestial Events: The bas-reliefs in the palace area offer insights into the life and beliefs of the Persian Empire, including the depiction of celestial events and their significance in marking the passage of time. This illustrates the advanced understanding of astronomy and its integration into cultural and religious practices.

Treasury Stocked with Wealth: The great treasury of Darius was not only an architectural feat with the foundations of walls and 250 columns but also served as a storage for immense wealth. Ancient evidence suggests it was well-stocked, reflecting the empire's prosperity and the effectiveness of its governance and trade networks.

Survival and Rediscovery: After its destruction by Alexander the Great in 330 BC, Persepolis was lost under dust and sand for centuries, becoming a mere shadow of its former glory. Its rediscovery in the 1930s and the subsequent unveiling of its ruins highlight the resilience of its structures and the enduring legacy of the Persian Empire.

Advanced Stone-Cutting Techniques: The laser-like precision and advanced stone-cutting techniques used in the creation of Persepolis are attributed to a civilization far more technologically capable than those historically recognized for the site's construction. This level of craftsmanship, including mythical carvings and the integration of megalithic stones, suggests the involvement of a lost civilization with superior technological knowledge and skills.

Enigmatic Clamping Techniques: Unique clamping methods used to link stones in certain structures around Persepolis and nearby sites indicate a highly sophisticated understanding of construction, not seen elsewhere. These methods, alongside the Cyclopean signature blocks, point to a complex knowledge of engineering and architecture that seems out of place for the era and region according to conventional historical accounts.

Inscriptions Admitting Re-Inhabitation: The presence of inscriptions left by ancient Persian rulers, such as Darius the Great, openly admitting to the re-inhabitation of Persepolis, supports the theory that the site, along with its remarkable structures, predated the Persian Empire. These inscriptions suggest that even the rulers themselves believed the site to have been built by a civilization or beings of a divine nature.

Naqsh-e Rostam's Precision: The rock-cut structures of Naqsh-e Rostam, located near Persepolis, demonstrate an astonishing level of precision that is hard to attribute to the ancient civilizations known to have existed in the area. The execution of these structures, with their enormous megalithic blocks and intricate carvings directly out of solid stone, points to an advanced technology or knowledge that remains unexplained by mainstream archaeology.

The Great Staircase's Architectural Pinnacle: Described as the most highly advanced precision work attributed to the Cyclopean civilization, the Great Staircase at Persepolis represents a pinnacle in architectural design. Its existence suggests a nearing end of this civilization's legacy on Earth, raising questions about their technological advancements, the reasons for their demise, and whether they had rediscovered and attempted to complete ancient structures left by an even earlier civilization.