Dover has plenty of history that you can explore from a Roman house to the Castle high above the White Cliffs through to the 2nd World War.
The Tourist Information website is http://www.aboutbritain.com/towns/dover.asp, and has links to all sorts of activities, hotels, Bed & Breakfasts, things to do (the list at the bottom, not the left) including animal parks, art museums, cinema, theatres etc.
Hope this helps,
Alan & Katrina
Next Cruise: P&O Adonia June 2014
Last Cruise: P&O Oriana Nov 2013
Golden, Grand(2), Caribbean, Sea(4+1 aborted)
Adonia(4+1), Arcadia, Artemis(2), Aurora(5), Azura, Oceana(3), Oriana(11), Ventura(2), Victoria(5)
QM2(2), QE2(9), QV(5), QE, Caronia(2), Minerva II, Fred.Olsen(8), NCL Jade, =X= Eclipse, HAL Ryndam