In 1980 Israeli archaeologist Adam Zertal (who died in October 2015) was doing survey work of the tribal region of Massaneh when he discovered something really interesting. It turned out to be the remains of a Hebrew altar that dated back to 1250 BC, the period when the Israelites moved to Canaan and settled there.
Zertal believed that this altar was the one which Joshua built as his fulfillment to Moses’ command to build one for God on Mount Ebal. (Joshua 8:30, King James Version: “Then Joshua built an altar unto the LORD God of Israel in Mount Ebal,”)