IT COULD be one of the most significant sites on Earth but “Australia’s Stonehenge” remains mostly a mystery to this day.

The incredible ancient stone arrangement was explored in 1939 by Frederic Slater, the former President of the Australian Archaeological and Education Research Society.

At the time, Slater penned a series of excited letters about the discovery, which were unearthed in 2013 by Richard Patterson, a teacher at the Brunswick Valley Historical Society.

“The mound is one of the oldest; I should say the oldest, forms of temples in the world and dates back to the Palaeolithic age with the advent of first man,” Slater is believed to have written.

Besides these notes, little is known about the site, which Slater called “more important than Stonehenge”. All but destroyed in the 1940s, it’s said to lie some 40 kilometres from Mullumbimby, in the far north of NSW, but the exact location has never been disclosed for fear the little that remains could be trashed.

The mysterious site is believed to contain 181 standing stones, including sandstone rocks that don’t appear to have occurred there naturally, because the closest sandstone deposit lay more than 20 kilometres away and at the time there were no tools to move them that distance.

It’s believed they may hold inscriptions of the first example of human language. One that’s very complicated, multi-layered and has “28,000 words”.

This year, father and son team Steven and Evan Strong set out to bring awareness to what they believe is one of the most important sites on the planet.

The duo argue a combination of recent evidence they’ve uncovered, along with artefacts and Slater’s testimony, prove humans didn’t just come “out of Africa” but instead emerged from Australia.

The Strongs began their “Forgotten Origin” lecture tour at Byron Bay earlier this year, detailing the evidence, local news site The Northern Star reported.

“His (Slater’s) letters were lost and found,” Mr Strong said. “What we’ve now found is archeology that backs up his theory that this was the first language ever (and) was recorded there.

“The language is a combination of hand signs, letters, “sacred signs”, and body parts … Slater had compiled over 28,000 words in this language.”

Sadly, the site was so badly damaged though, that it makes further investigation virtually impossible.

“They were going to set it up like Stonehenge ... it was published all over Australia in major papers, then the site was destroyed, and once it was destroyed the whole thing disappeared, and all of Australia’s notes from 1930 onwards disappeared too.”

“All we’re trying to do is prove that all the work he did is correct.”

While it’s not known whether the existence of this place will ever be definitively confirmed, there is another area dubbed “Australia’s Stonehenge” in Glen Innes, NSW, and this one is very real.

Also known as the “Australian Standing Stones”, they have surprised many visitors to the town. Built by locals to honour their Celtic heritage, it’s comprised of 40 huge granite rocks, including a circle of 24 rocks.

Enjoy.