Boasting Roman ruins, a Norman keep and a lavishly ornate Victorian stately home, Cardiff Castle isn't your usual Welsh fortress.
Cardiff Castle
Cu Chi Tunnels
The ingenious, sprawling network of tunnels were used by the Viet Cong to carry out a guerilla campaign against the US during the Vietnam War.
Bletchley Park
The centre of Britain's code-breaking activities during the Second World War is a fascinating place and well worth a visit.
Little Old World 