Last weekend went to Powys for a weekend away with Herself. One afternoon we visited Llandrindod Wells and stumbled across the National Cycle museum. I had no idea it was there and spent an hour or so wandering around looking a bikes from the 1800's to the last 10 years or so. Not a lot of carbon fibre there.
Interesting to see the changes in design. In one sense bikes from 100 years ago look very similar to todays bikes and yet looking closely even bikes from 20+ years ago have significant changes, down tube shifters and toeclips.
Certainly worth a visit if in the area, though not on a Sunday when cafe's are shut, and there is some excellent riding in the area.