Pearl Island (Illinois)

Shuck Island is a small island in the Mississippi River, located in Pike County, Illinois, opposite Hannibal, Missouri.

Cave City is an unincorporated community in Marion County, in the U.S. state of Missouri. The community was named for nearby Mark Twain Cave.

Bear Creek is a stream in Marion and Ralls counties in the U.S. state of Missouri. It is a tributary of the Mississippi River. The creek enters the Mississippi on the southeast side of Hannibal. Bear Creek was named for the fact bears were hunted there by pioneer citizens.

Mark Twain Cave — originally McDowell's Cave — is a show cave located near Hannibal, Missouri. It was named for author Mark Twain whose real name was Samuel Langhorne Clemens. Clemens lived in Hannibal from 1839 to 1853, age 4 to 17. It is the oldest operating show cave in the state, giving tours continuously since 1886. Along with nearby Cameron Cave, it became a registered National Natural Landmark in 1972, with a citation reading "Exceptionally good examples of the maze type of cavern development." The cave — as "McDougal's Cave" — plays an important role in the novel The Adventures of Tom Sawyer (1876) by Mark Twain and was renamed in honor of the author in 1880.

Hafner Grocery Warehouse is a historic commercial warehouse located at Hannibal, Marion County, Missouri. It was built about 1910, and is a three-story brick structure on a concrete foundation. It features seven bays of segmental-arched windows and a corbelled parapet.: 48–49  It was added to the National Register of Historic Places in 1986.

Ebert-Dulany House is a historic home located at Hannibal, Marion County, Missouri. It was built about 1865, and is a two-story, Second Empire style brick dwelling. It has a mansard roof and sits on a rock-faced ashlar foundation. It features a large bracketed hood above once sheltered a balcony and a wide bracketed frieze that runs below the modillioned cornice. The house was restored in the late-1980s.: 2  It was added to the National Register of Historic Places in 1983. It is located in the Maple Avenue Historic District.

Digel Block was a historic commercial building located at Hannibal, Marion County, Missouri. It was built in 1901, and was a two-story red-brick building. It featured an ornamental parapet screening a flat roof.: 54–55  It has been demolished. It was added to the National Register of Historic Places in 1986.

The buildings at 207–209 South Main St. are two historic commercial buildings located at Hannibal, Marion County, Missouri. They were built about 1860 and are two two-bay, two-story brick storefront buildings. They have high transom or fascia areas and segmental arched windows on the second story.: 52–53  It was added to the National Register of Historic Places in 1986.

Mark Twain Hotel is a historic hotel building located at Hannibal, Marion County, Missouri. It was designed by Barnett, Haynes & Barnett and built in 1905. It is a four-story, Renaissance Revival style steel-frame structure with a granite foundation and beige pressed-brick exterior. The annex was built in 1918. It features semicircular arches over the main door and adjacent windows.: 50–51  It was then added to the National Register of Historic Places in 1986.

Holmes–Dakin Building is a historic commercial building located at Hannibal, Marion County, Missouri. It was built in 1894, and is a two-story brick structure with a coursed rubble foundation and a flat roof. It features a corbelled brick frieze with matching corbelled parapet, capped by a stone molding. It originally housed a cigar factory.: 46–47  It was added to the National Register of Historic Places in 1986.

The Mark Twain Memorial Bridge was a cantilevered through truss bridge carrying US 36 over the Mississippi River. It was replaced in 2000 with the extension of I-72 and subsequently demolished.

Davidson Building was a historic commercial building located at Hannibal, Marion County, Missouri. It was built between 1903 and 1905, and was a two-story Romanesque Revival style building. It had a three-bay rock-faced ashlar facade and party walls. It featured arched windows with radiating voussoirs.: 44–45  It has been demolished. It was added to the National Register of Historic Places in 1986.