Where did archaeologists discover 4500 years old Sumerian Tombs

The archaeologists discovered the 4500 years old Sumerian Tombs in the city of Ur in Iraq. The archeologists have just found one of the walls and numerous graves from the same period that is estimated at 2500 BC. Ur is considered as one of the priceless cities of Iraq in respect to Sumerian Civilization. The ethnic and the linguistic stock is still a mystery for the whole world till now. Ur has become the favorite for various foreign scientists and archeologists for a long time. Every now and again Ur surprises us with new discoveries related to the Sumerian civilization.