It's an interesting collection. You can find most things there. Some are obvious: there's a windmill, and a dovecote, and barns, and a stable. There's a former pub that's now the Edwardian tea room. Cottages of all ages give you a taste of life across the centuries, from Tudor times to post World War Two.
But it's the less obvious bits that I most enjoyed. For example there's the top off a redundant church from Smethwick. The spire of the 19th century St Paul's Church was made of wood, and by 1959 was severely rotten. It was replaced in the early 1960s with a fibreglass replica, which was lighter, and cheaper, than creating a new brick one. But in 1963 the church burned down and only the spire and tower survived. A new church was built alongside it, but that was made redundant in 1996.
But I think my favourite part was the National Telephone Kiosk Collection. Yes, phone boxes through the ages are lined up around a yard and each one is connected to one of three exchanges the museum owns. That means that excited children can phone each other (at a cost of 2p a call) and not realise that they don't have to shout. The REALLY fun part is that they need instructions to use a phone dial. They don't realise they have to take their fingers out of the slot once they've rotated the mechanism. Consequently they mis-dial a lot and end up talking to total strangers!
There are also a few other things that aren't technically buildings, like a showman's wagon for example, and the wonderful roadmenders' wagon, both the type of thing it's trendy to take a holiday in these days. How would the old roadmenders who used to travel round in the carts react to the idea that their old 'make do' accommodation is now considered a treat?