The county also contains rich sources of limestone found along the river bluffs in the county from Henderson County on the north, to the town of Warsaw to the south. . Today, visitors delight in seeing the replication of the original Nauvoo Mormon Temple which historical accounts report as built of this limestone.
As early as 1840 or ’41,’ a deposit of geodes was found in the vicinity of the now non-existent village of Montebello, north of the present town of Hamilton. Today, rock collectors still find fascination with these, and other rocks and fossils found in the area. Tourists will also find Eagle watching near the Mississippi River Bridge between Hamilton, IL and Keokuk, Iowa in the winter months. In mid January the tri-state area hosts a celebration of not only the eagle watching, other forms of river wildlife, and also Native American culture and a variety of related arts and crafts.