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The discoveries matched years of archaeological ground research to reveal Mahendraparvata, a lost mediaeval city where people existed on a mist-shrouded mountain called Phnom Kulen 350 years before the building of the famous Angkor Wat temple complex in north-western Cambodia.
''This is where it all began, giving rise to the Angkor civilisation that everyone associates with Angkor Wat,'' Evans said.
'With this instrument - bang - all of a sudden we saw an immediate picture of an entire city that no one knew existed which is just remarkable,''
They found two temple sites where no carved rocks or ancient bricks could be found scattered nearby, indicating they have never been looted.
They also found a cave with historically significant carvings that was used by holy hermits who were common during the Angkor period.
several metres high across the mostly buried city.
One untested theory was that they were tombs where the dead were buried but there could be many explanations.
''We are still trying to work out what these things were,'' Evans said.
Phnom Kulen was covered by jungle for centuries until loggers moved into the area in 1990s after years of civil war.
The area was a former stronghold of the Khmer Rouge, a Maoist-influenced organisation that failed spectacularly in the 1970s to replicate the agricultural achievements of the Angkor period, causing the deaths of more than a million people from overwork or starvation, while hundreds of thousands more were executed.