Bosnia's mystery pyramid is to be investigated and inspected by a team of experts from the United Nations Educational, Scientific and Cultural Organisation, it emerged yesterday. Semir Osmanagic, an amateur archaeologist, has caused a stir with his find at Visocica hill in the centre of Bosnia, although local and European archaeologists denounce it as nonsense. Geologist Aly Abd Barakat, an Egyptian researcher sent by Cairo to assist Mr Osmanagic's team last month, has said that the 2,300ft hill did appear to be a primitive man-made pyramid of uncertain age. Mr Barakat said huge stone blocks found on the three sides of the hill used the same type of artificial cement as ancient Egyptian pyramids. Mr Osmanagic's team is also investigating Pljesevica hill - which he calls the Moon Pyramid - as well as tunnels he believes connect three pyramids. The researchers have found a sandstone monolith in one of the tunnels with enigmatic symbols engraved on it, which will be sent to Egypt for analysis. Mr Osmanagic, who has studied pyramids in central America for the past 15 years, said that satellite and radar analyses have revealed the perfect geometry of Visocica and precise alignment of its sides with four cardinal points.