In the UK there are Concordes in Edinburgh, Bristol, Manchester & Duxford.
There may also be one in Yeovilton as well.
Duxford & Yeovilton are prototypes & never took passengers but i've walked round & inside the one @ Duxford.
You can see the Manchester Concorde as you taxi along the runways on take off & landing & I think it's a little pricey to visit when you consider that if you visit the one in DC & Duxford you get to see other aircraft as well.