Ark of the Covenant is in Israel, in Zedekiah's Cave.
The entrance to Zedekiah's Cave (above) is at the Jerusalem city wall, northeast of the Damascus Gate. Entrance fee is about $4 usd.
Ron Wyatt originally found the Ark of the Covenant by digging in the area of the Garden Tomb, and had found the Ark by cutting through rock and also using tunnels that had anciently been created by water erosion. Once in the cave which housed the Ark, Ron noticed an entrance heading in a different direction from that which Ron had entered. He theorized that the Ark had originally been brought to the cave through that entrance, then it was sealed by stones. Ron noticed on maps of Zedekiah's Cave, of how it stretched out for 750 feet, including the direction of the Garden Tomb. Ron then began searching in Zedekiah's Cave for the original route by which Jeremiah had taken the Ark to its secret hiding place. In the early 1900's, a carving of a four legged winged cherub, had been found.
http://www.arkdiscovery.com/zedekiahs_cave.htm