When visiting Jefferson Island, please see the centuries old mastodon bones and teeth on display in the Gift Shop that were found on the property. Explore the tree where Jean Lafitte buried his treasure. Some of the coins that were found are on display in the Joseph Jefferson Home. Also notice the large oak tree in front of Joseph Jefferson Home. Grover Cleveland would visit Mr. Jefferson and nap under the massive old oak. Explore the history of the salt mine incident that occurred in November 1980. Texaco drilling crew punctured a hole in the salt mine creating the largest man made sink hole in the world. See the U-Tube Video under Jefferson Island History. Plenty to explore here at Jefferson Island!