As the Great River Road merges onto Highway 3, aka Lewis and Clark Blvd, another view of the vast petroscape of the American Bottom comes into view. Wedged between the ConocoPhillips refinery and the levee, is the unincorporated community of Hartford--known for being the site where Lewis and Clark spent the winter of 1803-1804. At the south end of town, where the short residential blocks give way to a checkerboard of agricultural and petroleum landscapes, stands the splintered form of the Confluence Tower. Begun in a commemorative effort of the bicentennial of the Lewis and Clark expedition, the tower now welcomes visitors to its three levels for a ticket cost of $4. Tour guides are usually local retired persons and carry a wealth of knowledge about the region and its history. Ask Dave about the cabbage.