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In page Jericho:

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The Pre-Sultan (c. 8350 – 7370 BCE) is sometimes called Sultanian. The site is a 40,000 m2 (430,000 sq ft) settlement surrounded by a massive stone wall over 3.6 m (12 ft) high and 1.8 m (5 ft 11 in) wide at the base, inside of which stood a stone tower, over 8.5 metres (28 ft) high, containing an internal staircase with 22 stone steps[6][7] and placed in the centre of the west side of the tell.[8] This tower and the even older ones excavated at Tell Qaramel in Syria[9][10] are the oldest towers ever to be discovered.[citation needed]