It is from the ruins of Al Balid (Baleed) there are a few more posts from here: Here Here
A quick description from:-
Omantourism.gov.om: The history of Al Baleed dates back to 2000 BCE (up date with recent discoveries, now 5th millennia BCE) when it had its main settlement at the eastern outskirts of Salalah. During the late Iron Age it was an active central city and was still prosperous during the Islamic era. It was mentioned by Ibn Battuta in the 13th century that the city of Al Baleed, situated in the immediate vicinity to the Indian Ocean was an important Omani harbour. From its large wall and strong forts it is clear that the city was renovated in the style of other contemporary Islamic cities during 13th century CE. The city benefited from the prosperous frankincense trade and was commercially linked to ports in China, India, the Indus Valley, Yemen, East Africa, Iraq and Europe. Chinese traveller Jan Jokao wrote that frankincense was one of the main commodities traded in the city, and research has revealed that at one time the Chinese city of Quanzhou imported approximately 174,337 kilograms of frankincense from Al Baleed.
The famous traveller Marco Polo (1285) described the city as prosperous and one of the main ports on the Indian Ocean, and said it was a booming commercial centre.
Ruins.
David A Lockwood 
I won’t say ‘lovely’ ruins.. Poignant could be a better word… any history behind these, David.?.
It is from the ruins of Al Balid (Baleed) there are a few more posts from here:
Here
Here
A quick description from:-
Omantourism.gov.om:
The history of Al Baleed dates back to 2000 BCE (up date with recent discoveries, now 5th millennia BCE) when it had its main settlement at the eastern outskirts of Salalah. During the late Iron Age it was an active central city and was still prosperous during the Islamic era. It was mentioned by Ibn Battuta in the 13th century that the city of Al Baleed, situated in the immediate vicinity to the Indian Ocean was an important Omani harbour. From its large wall and strong forts it is clear that the city was renovated in the style of other contemporary Islamic cities during 13th century CE. The city benefited from the prosperous frankincense trade and was commercially linked to ports in China, India, the Indus Valley, Yemen, East Africa, Iraq and Europe. Chinese traveller Jan Jokao wrote that frankincense was one of the main commodities traded in the city, and research has revealed that at one time the Chinese city of Quanzhou imported approximately 174,337 kilograms of frankincense from Al Baleed.
The famous traveller Marco Polo (1285) described the city as prosperous and one of the main ports on the Indian Ocean, and said it was a booming commercial centre.