(HANNIBAL)—Today marks the 100th anniversary for the Mark Twain Boyhood Home and Museum.  Ceremonies begin at noon on the museum mall on Hill Street between Main and Third. The Mark Twain Museum Gallery plans to open two new exhibits today. 100 Years of Memories is a photographic retrospective. The Boyhood Home art exhibit features art of Twain’s childhood home. A behind-the-glass VIP tour of the Boyhood Home is planned from 5 until 7 p-m today. Tickets for that are 20 dollars. Contact the museum’s marketing and community relations office for reservations.