Then Samuel took a stone and set it up between Mizpah and Shen. He named it Ebenezer, saying, "Thus far the LORD has helped us." 1 Samuel 7:12

So Jacob set up a pillar in the place where God had spoken to him--a stone marker--and he poured out a drink offering on it and anointed it with oil. Genesis 35:14

Joshua also set up twelve stones in the middle of the Jordan, in the place where the priests who carried the ark of the covenant were standing. And the stones are there to this day. Joshua 4:9

Joshua recorded these things in the Book of the Law of God. Then he took a large stone and set it up there under the oak that was near the sanctuary of the LORD. Joshua 24:26

So, it looks like these mighty men of God such as Samuel & Joshua set up memorials for what God had done in their lives, lest the children of God forget the many wonders. 

As we are getting ready to wrap up this year let us ponder in our hearts over all the good things God has done for us, setting up memorials if we need to, so that we are reminded of His grace and can thus praise the Lord.