Yes, an entire Medival town is hidden behind this giant rock. Monemvasia is a Greek town that was invaded around 375 AD due to the earthquake. During the earthquake, this stone was separated and its existence was lost. It was an important trading port in ancient time and had a population of 40,000 people.
Today, this town is turned into abandoned place with ruin churches that are now being replaced by hotels.
Monemvasia was a trading port for hundreds of years in modern Greece.