Egypt’s oldest pyramid was built almost 5,000 years ago but a similar structure hidden beneath rubble could be up to four times older.
If true, the claim could rewrite prehistory and shed light on an obscure yet powerful and advanced ancient civilization.
Geologist Dr Danny Hilman believes that a site in West Java is revered because it hides an ancient temple built between 9,000 and 20,000 years ago.
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It is nestled among volcanoes, banana palms and tea plantations, at 2,903 ft (885 metres) above sea level some 75 miles (120km) south of Jakarta.
Chunks of volcanic rubble jut out up from the stepped hillside, which is considered sacred by the Sundanese people who live locally.
Geologist Dr Danny Hilman believes the site is culturally important is because it is an ancient pyramid which was built between 9,000 and 20,000 years ago.
He suggests that it may have been built for worship or astronomy.