Video Summary
Derinkuyu and other underground cities are real, multi-level settlements carved into rock with ventilation, wells, stables and heavy stone doors.
Derinkuyu is about 85 m deep (18 floors) and could shelter up to ~20,000 people; its ventilation and defenses indicate long-term planning and engineering.
The Longyou Caves in China consist of 24 uniform caverns; excavation removed millions of tons of rock with no documented builders or nearby rubble.
There are no inscriptions, construction tools, or records that conclusively identify the original builders — later groups used and expanded these complexes.
These sites form a pattern of sophisticated, unexplained ancient engineering that challenges the completeness of the historical record.
In 1963 a villager in Turkey noticed chickens disappearing into a crevice while renovating his home; after breaking through the wall he revealed tunnels that led to the multi-level underground city now known as Derinkuyu.
Derinkuyu reaches about 85 meters deep (roughly 18 floors), could shelter an estimated 20,000 people, and contains ventilation shafts, water wells, kitchens, stables and heavy stone doors.
The Longyou Caves consist of 24 virtually identical caverns carved from sandstone with consistent chisel marks; excavation removed an estimated 2.5 million tons of rock yet left no historical records or obvious rubble deposits.
There are no inscriptions, original construction tools, or contemporaneous records that name builders; archaeologists can identify later occupants by pottery, but distinguishing builders from later users remains unresolved.
Derinkuyu and the Longyou Caves are part of a wider pattern of large, sophisticated ancient constructions (e.g., Baalbek, Pumapunku, Malta's Hypogeum) that point to gaps in our understanding of past engineering and recordkeeping.
"Beneath your feet, there are actual cities, but nobody knows who built them."
The existence of enormous underground cities, such as Derinkuyu in Turkey, has been established, featuring complex multi-level structures carved directly into rock.
These complexes are equipped with sophisticated ventilation systems, water wells, and heavy stone doors that can only be opened from the inside.
For instance, Derinkuyu has 18 floors and could accommodate up to 20,000 people, all while extensive excavation of around 2.5 million tons of rock occurred without leaving any historical records.
"A local man in a small village in Turkey discovers a tunnel leading to an underground city."
In 1963, during renovations in a Turkish village, a man noticed his chickens disappearing into a small crevice, prompting him to investigate further with a sledgehammer.
This led to the discovery of a tunnel system that revealed a vast underground city, 85 meters deep and possessing the dimensions comparable to a 25-story building.
The complex contained essential facilities such as kitchens, schools, and livestock stables, indicating it was more than merely a hiding place; it was a fully self-contained and defensible settlement.
"The scale and level of coordination required to build Derinkuyu is exceptional."
Derinkuyu's architecture showcases an impressive level of planning and engineering, with its ventilation system capable of delivering air across the entire underground complex.
The scale of construction suggests that such a project would have taken generations, raising questions about who built the city and when.
The most frequently suggested builders are the Frigians, dated around 700-800 BC, while other theories extend to the Hittites or even Byzantine communities that later expanded the complex.
"There are no inscriptions, no tools, and no construction records to reveal who built Derinkuyu."
A critical aspect of Derinkuyu’s mystery is the absence of clear evidence identifying its original builders; no written accounts exist to clarify its origins.
Archaeologists can identify later occupants through pottery and artifacts, but determining the civilization responsible for building the structure remains elusive.
This challenge is compounded by the fact that over 200 similar underground complexes exist in Cappadocia, suggesting a broader, more organized effort over a long period.
"There's another lesser-known underground structure in China that makes Derinkuyu seem almost straightforward."
In 1992, a significant discovery occurred in Eastern China when farmers drained ponds and uncovered 24 enormous caverns.
The excavation of these caves is estimated to have required the removal of around 1 million cubic meters of rock, equating to a labor effort similar to constructing an Egyptian pyramid, yet there are no historical records documenting this feat.
Such unexplained structures further enhance the compelling nature of underground cities and emphasize the profound mysteries of ancient civilizations.
"For a project of this magnitude, for this scale of construction to leave no single trace in any surviving document is astonishing."
Despite the Chin dynasty's reputation for extensive recordkeeping, the construction of the Longu caves has left no documentation, leading to confusion among archaeologists regarding the civilization responsible for their creation.
The absence of records surrounding the Longu caves is unusual, especially considering that such a large-scale project would typically generate some forms of documentation.
"We're talking about 2.5 million tons of rock that was removed from the earth and vanished so completely that after 30 years of archaeological investigations, we still cannot find a single convincing trace of where it went."
The excavation of the Longu caves yielded an estimated 2.5 million tons of sandstone that seems to have vanished without a trace, as no rubble has been found at the site.
There are no signs of the rock being utilized for nearby construction or identifiable in the geological record, suggesting a unique and unexplained process of removal.
"They are strikingly consistent, same angle, same spacing, and repeated across all 24 caverns completely parallel."
The caves are characterized by identical chisel marks on all walls and ceilings, indicating the work of a centralized workforce rather than independent teams, suggesting advanced architectural knowledge.
Each cave features precise architectural elements, including a vertical shaft, carved staircase, and drainage system, showcasing a sophisticated understanding of both excavation and water management.
"Many theories have been proposed, but not one of these theories has a single piece of archaeological evidence."
The reasons behind the construction of the Longu caves remain unclear, with theories ranging from grain storage to military shelters or ceremonial uses, yet none pose sufficient archaeological support.
The dating of the caves and their overall purpose is still unknown, contributing to the broader mystery surrounding similar structures globally.
"These structures suggest that the biggest discoveries may still be underground."
The Longu caves are part of a pattern of large, sophisticated ancient structures that lack clear historical explanations, paralleling other notable sites around the world like Balbeck and Pumapunku.
Such recurring mysteries raise questions about the incomplete nature of our historical record and imply that ancient engineering feats were more widespread than currently acknowledged.
