The architectural importance of this gate and the tomb of Clytemnestra nearby, is that they are not true arches but corbel arches. True arches were invented not much later, the oldest still standing true arch bridge is also built by Mycenaeans, the Arkadiko Bridge .
A large cadaver tombstone slab can be found embedded in the wall at the north-east corner of St Peter's graveyard, together with the four sides of the tomb itself. The tombstone dates back to the 14th century and is part of a fashion widespread in Europe, although relatively rare in Ireland, which explored bodily decomposition and human mortality. This reflected a preoccupation with death arising from the great plague of 1347 to 1350, and subsequent epidemics. This particular slab dates from 1520 and was associated with Sir Edmond Golding and his wife Elizabeth Flemying, the daughter of the Baron of Slane.
Old Sarum, in Wiltshire, South West England, is the ruined and deserted site of the earliest settlement of Salisbury. Situated on a hill about two miles (three kilometres) north of modern Salisbury near the A345 road, the settlement appears in some of the earliest records in the country. It is an English Heritage property and is open to the public. - Wikipedia
Additional surface smoothing near the edges of blocks has been attributed by some researchers to a chemical etching "mortar" composed of pyrite mining slurry and plants containing calcium oxalate.[31] Some species of bacteria from the genus Thiobacillus are able to process sulfidic minerals and produce sulfuric acid as a byproduct; complexation with oxalate increases the etching potential of the mixture. This would correspond with both contemporary descriptions of the Incan masonry process[31] and regional folklore suggesting that Incan masons and a local bird species, the pito, were capable of softening rocks with a local herb.[30]
One of my archaeology professors who focused on the Inca Empire bought into theories around using a kind of portable jig that allowed them to match surfaces similar in principle to how key cutters match the contours of a source key.
This was over a decade ago already so not sure where those theories line up.
That being said, the empire had INCREDIBLE engineering skill, and with a system of labour tax, I figure the proliferation of those skills would be great, and with such a broad base of the population exposed to engineering tasks I imagine there were many opportunities for diverse minds to contribute to process improvements
My sense is there would need to be some kind of mechanical assist to get things this both square, and flat. Two big flat rocks with an jig holding them and then you move the stones in a circular manner (like a oscillating sander but you move the piece not the aggregate).
Like just making a very flat surface is a surprising engineering feat, but I could imagine
I guess OPS picture really betrays how complex of stonework they could really put out. In OP's pic, they're uniform and square: not at all required to get the perfect fits that Inca masons are truely legendary for.
Photos of ruins and structures from past eras
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