Made out of basaltic material

"The Principal Structures Of The Fortress Are Situated On Different Levels Of The Upper Third Of The Hill And Were Constructed In Dressed Stone (Basalt) Blocks With A Rubble Core." (Ouv Statement)

"Unique Artistic Works Carved Out Of The Hard Dolerite Stone Giving It A Metal Like Finish With Intact Lustre" (Ouv)

"There Are Over 100 Caves At The Site, All Excavated From The Basalt Cliffs In The Charanandri Hills" (Wiki)

"Embodied In The Well-Preserved Distinctive Basalt Architecture" (Ouv)

"Wall Construction Using Massive Columnar Basalt Stones" (Ouv)

"The Material Used To Construct The Currais And Buildings Is Largely Composed Of Local, Irregular, Weatherworn, Black Basalt Rocks." (Official Description)

"Basalt, A Hard, Dense Stone Used For Toki And At Least One Of The Moai." (Wiki)
See En.Wikipedia.Org

"Some Of The Prominent Edifices Of Old Bombay Constructed From Basalt Include The High Court, .., The Prince Of Wales Museum..." (Iugs)
See Iugs-Geoheritage.Org

Metropolitan Cathedral Façade And Templo Mayor Are Made Of A Red Basalt, Called Tezontle
See Www.Researchgate.Net

"The Caves Are Hewn From Solid Basalt Rock" (Wiki)

"The Caves Are Hewn From Solid Basalt Rock" (Wiki)

Road Surface Was Made Of Basalt Stones Carefully Cut And Fitted Together
See Www.Livius.Org

"Thimlich Ohinga Was Constructed Using Unshaped And Random Loose Stones Made From Local Basalt." (Wiki)
See En.Wikipedia.Org