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You may have noticed there are quite a few museums putting objects from their collections on A History of the World. But I hadn't realised quite how many until someone told me that we have just been joined by our 500th museum.

That's pretty amazing in just six months - and it's certainly way beyond our expectations.

The project started out with the idea of Radio 4 and the British Museum working together on a radio programme. But once the idea of 100 objects was hit upon and it was decided that there should be a website for them, it seemed only natural to invite other museums to join in. After all there are incredible objects in museum collections across the UK - and not just in the big buildings in city centres.

We've got museums of all sizes on the site, from the National Museums of Scotland, Wales, Northern Ireland and large regional museums like Manchester Museum to ones that focus on a particular subject such as the Walsall Leather Museum, the Museum of Speed, and the Bagpipe Museum. Many other kinds of heritage site have added objects from their collections too, such as HMS Trincomalee, Geevor Tin Mine and Hereford Cathedral, who have contributed the amazing Mappa Mundi.

New objects are being added every day. Some of the latest ones include 'Numoli' figures from Sierra Leone, a Roman child's leather shoe, a cash register and the Domesday Book.

So thank you to all the museums who have joined the project. We're looking forward to seeing more of your objects. And if you haven't joined in yet, there's still time. Anyone can add an object to the website - just take a look at our guide on how to do it.

• Almost 200 museums are now also running Relic trails, including the winner of this year's , . So if you're looking for something to keep the kids entertained in the holidays, then see if there's a Relic trail near you.

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