As reported in WorldNet Daily:
Dr. Eilat Mazar, one of Israel's top archaeologists, ended her presentation Wednesday to the 13th Annual Conference of the Ingeborg Rennert Center for Jerusalem Studies on "New Studies on Jerusalem," with a surprise announcement. She had discovered remnants of the fifth century B.C. wall built by Nehemiah, the account recorded in the Old Testament book of the same name...
... Mazar, who is perhaps best known for her recent excavation that many believe has revealed the palace of King David, was working on an emergency project to shore up remains of a tower long believed to date from the Hasmonean period, 142-37 B.C., that was in danger of collapsing.
According to an account of the conference in "The Trumpet," Mazar said, "Under the tower, we found the bones of two large dogs – and under those bones a rich assemblage of pottery and finds from the Persian period. No later finds from that period were found under the tower."
Had the tower been built during the Hasmonean dynasty, the Persian-era artifacts would represent an unexplained chronological gap of several hundred years. The tower, said Mazar, had to have been built much earlier than previously thought and the pottery data placed it at the time the Bible says Nehemiah was building it.