They also found a 50-metre-deep water tunnel likely to be the ancient civilisation’s ingenious way to store water.
The prehistoric city dates back to the ninth century BC Urartian Kingdom.
Lead researcher Ömer Faruk Kızılkaya said he was tipped off about rumours of treasure hunters digging for artefacts in the rural areas in the Dumlu neighbourhood.
He believes the stone tombs belong to a king, religious head or another prominent figure of the Iron Age dynasty.
“This is the place where the funeral ceremonies of kings or people, who are highly respected by the public, were performed.
“We think there is a tomb here that belongs to either a king, ruler, or religious man,” Kızılkaya told local media.
“With simple classification, there are burial chambers made up of one room and ones with more rooms.
“These were designed especially as a space to be used for the dead in the afterlife by cutting the rocky area, smoothing the rocks and processing them. Even in ancient times, food was left here as a sacrifice for their beliefs.”
Mr Kızılkaya urged the government to declare the site protected to save it from being ruined.
“This is an important area belonging to ancient times, a place where a ritual was made. We see the rock tombs. This place should be taken under protection for detailed study,” he added.
The Urartian Kingdom was located in the mountainous regions of southwest Asia between the Black Sea and the Caspian Sea, but at present is occupied by Turkey, Iran and Armenia.
This isn’t the first time an ancient city has been discovered in Turkey, the home to one of the oldest permanently settled regions in the world.
The sunken ruins of ancient Simena, which was destroyed by earthquakes during the second century, lie just off the coast of the mainland’s Antalya Province.
After being closed off to visitors for three decades, the historical site is expected to bring in big tourist dollars with plans to now open it up to holiday-makers.
Underwater exploration has been banned since 1986 as part of a series of measures to protect the lost city’s heritage, but the Antalya Mayor wants to overturn the ban and open it up to a growing alternative tourism market.