Koguna na wucin gadi na Alapraia

Kogon Artificial na Alapraia ( Portuguese   ) ya zama prehistoric necropolis kafa ta kaburbura hudu na karkashin kasa ko hypogea wanda aka halitta ta hanyar hako dutsen marlstone ta amfani da kayan aikin dutse. Suna zaune a tsakiyar yankin Alapraia a cikin Estoril, gundumar Lisbon, Portugal kuma an yi imanin cewa sun kasance a cikin kwata na ƙarshe na 4th Millennium KZ kuma an yi amfani da su azaman necropolis fiye da shekaru dubu ɗaya.

 Kogo 
Kogon guda hudu suna kewaye da su kuma, a wasu lokuta, suna karkashin gidaje na zamani kuma ana lissafta su daban-daban, bisa ga ranar da aka tono. Ana gano su a rukunin yanar gizon amma baƙi na yau da kullun ba za su iya isa gare su ba. Duk kogon suna da tsarin gini iri ɗaya, wanda ya ƙunshi dogon koridor ko ɗakin kwana don shiga, tare da ɗaki mai da'ira a ƙarshen tare da hasken sama a sama, kariya ta shinge. An yi imanin hakan ya ba da damar sanya gawarwakin a cikin ɗakin, lokacin da matakan zama suka daina ba da izinin shiga ta hanyar.  Kogon 1 yana da tsayin mita 19 kuma masanin ilmin ƙasa F. de Paula e Oliveira ya fara bayyana shi a cikin 1889. Wani ɗaki mai zagaye yana da diamita na mita 6.2 da tsayin mita 2.8 a tsakiya. Shi ne mafi girma a cikin kogo hudu kuma a lokacin da aka tono an yi amfani da shi azaman barga ko alade da kantin sayar da itace. An kewaye shi da katanga mai tsayi. Uba Eugénio Jalhay da Laftanar Kanar Afonso do Paço ne suka tono kogo 2-4. Kogon 2 yana da jimlar tsayin mita 9, tare da ɗakin oval yana da diamita na mita 4.2-4.4 kuma tsayi a tsakiyar mita 2.2. An hako shi ne a shekarar 1932. Kogon 3 yana da diamita na mita 6.20 kuma tsayinsa ya kai mita 2.40 kuma an hako shi a shekarar 1942. An gano kogo na hudu a lokacin aikin kafa maɓuɓɓugar ruwa.  An hako shi a cikin 1943 kuma yana da tsayin kusan mita 11, tare da wani ɗan ƙaramin ɗaki na oval na diamita na mita 4.35 da tsayi a tsakiyar mita 2.4. 

Abubuwan da aka gano sun samo asali ne da yawa tun daga al'adun Beaker na rabin na biyu na karni na 3 KZ, tare da tsofaffin tukwane daga zamanin Chalcolithic (Copper Age) da ƙarin binciken shekarun Bronze na kwanan nan. Abubuwan da aka gano sun haɗa da tasoshin yumbu da aka yi wa ado, kamar kwano da kofuna, faranti masu siffa mai siffar geometric, goge-goge na ƙasusuwa, ƙwanƙwasa, lu'u-lu'u, gumaka masu jefa kuri'a, da kwatankwacin dutsen farar fata na ƙafar ƙafa biyu na takalmi, waɗanda aka yi imani da su na musamman. Abubuwan da aka gano galibi suna cikin gidan kayan tarihi na Condes de Castro Guimarães da ke kusa da Cascais, inda aka buɗe ɗakin binciken kayan tarihi don nuna su a cikin 1942.  

 Manazarta