Latrun was one of the key battle grounds in the 1948 War for Independence as the large British fort controlled the road to besieged Jerusalem. It changed hands several times during the battles.
Today it is the IDF Armoured Corps Museum – explanations on the key armoured battles over the years and an incredible number of tanks (friendly and captured) many of which are accessible. It is of course heaven for little boys (of all ages) but my experience is that it is a real family day out.
See IDF Armored Corps Museum for more details.
You can also visit Mini Israel which is extremely close.
Getting To The IDF Armoured Corps Museum
Signposted from Latrun Junction (Road 1 Tel Aviv – Jerusalem & Road 3)
Many buses pass through Latrun Junction.