Old rare coins and medallions

[Yuppi]

Hi

I have a huge collection of old rare coins as well as medallions and all as my geandparents and ancestors have a hobby of collecting item...
But to be honest, we youngsters dun really value this thing and I rather sell it then keeping it...
Any suggestion where to sell this item? I tried posting on ebay but I`m looking for a much more established organisation that can value this item or showcase it e.g museums

Thanks