False doors and niches at Alatri and Alba Fucens have been interpreted by some researchers as structural elements potentially providing lateral compression to prevent retaining walls from bending outward, analogous to modern dam buttresses. At Alba Fucens, archaeological evidence includes tunnels and retaining wall constructions. However, the characterization of pressurized aqueducts with siphons at these sites requires further verification, as does the claim that Romans generally avoided pressurized aqueducts due to complexity—some Roman aqueducts did employ pressurized sections and siphons.
False doors and niches function as buttress supports

Key facts
- False doors/niches in Alatri and Alba Fucens served as structural supports - cyclopean equivalent of dam buttresses
- Niches provide lateral compression to prevent retaining walls from bending outward
- Similar to modern dam engineering - same structural principle
- At Alba Fucens: pressurized aqueduct with siphon, tunnel (cloaca/sewage), and buttress-style retaining walls
- Romans avoided building pressurized aqueducts due to complexity of pushing water uphill
- Three niches needed for compression effect - one alone insufficient
- Alba Fucens has most advanced building applications: tunnels, pressurized aqueducts, and slab-buttress walls
- Similar niches found in Peru at Moon Temple near Machu Picchu
Site mentioned
Sources
[PDF] preview-9781400886586_A29559555.pdfapi.pageplace.de
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NEXUS NETWORK JOURNAL - Springer Naturelink.springer.com
It exhibits the major goal of Islamic architecture, according to which designers strive to achieve harmony between people, their environment and their creator.
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