II don't know where you are coming from Laura, but a trip to East Kent is very much worth while for history-viewing.
f you are thinking of Leeds Castle, stay on the M2 motorway for an hour and come down to Dover - there are loads of events some weekends, it's been revamped inside, hugely popular with tourists.
http://www.english-he...perties/dover-castle/
Just along the coast is Walmer Castle which used to be a residence of both the Duke of Wellington (see his boots!) and the Queen Mother - a pretty castle on the coast with lovely grounds. A bit further round, Deal Castle is open but empty apart from a few cannonballs - very tiny but nice for a lad, a pocket-castle!
You can then turn back up the coast and call it at Richborough Fort, which are Roman remains, often events like falconry happening there - then back to Reculver on the north Kent Coast which is a ruin but right on the sea.
Dover itself is worth a look, the Bronze Age Boat is in our little museum, next door is the Roman Painted House the Western Heights have Napoleonic fortifications but you really need a good day and a good imagination at the moment (except for the few days per year when they open the grand shaft and you can walk down from the top of the cliffs to shore level, inside the chalk, on a long winding staircase.