The Lost Tombs of Oman
maptia.com
maptia.com
https://en.wikipedia.org/wiki/Broch
NB Brochs aren't as old and are a lot bigger. However, the visual similarities are quite striking.
Edit: Obviously this similarity is coincidental - there aren't that many different ways of building a simple tower out of stone.
Both are amazing though.
However, it starts off saying it was discovered in the 90s by a British aviator but later talks about a local legend. So either the locals made up a legend recently or it wasn't really "discovered" in the 90s.
I tried to look up some information about the site but couldn't find anything definitive about how long it has been known about (a couple sites mentioned an archeological dig in the late 70s but it wasn't clear if it was at this site or nearby and one mention was on a conspiracy site so not exactly a credible source).
Seems they're not so far from main roads, so it's a bit odd about use of GPS and four wheel drive vehicles.
They probably even have souvenirs and guided tours in place.
https://maptia.imgix.net/photos/75985/1456101557.jpg?cs=srgb...
From what I gather from other articles, no human remains have ever been extracted from them. Perhaps the buildings were used for a religious purpose or for temporary shelter.