I've just launched a few more Podtours on my site. We already have Paris Sainte-Chapelle (shortly to be expanded to include the rest of the Ile de la Cité); Norwich, Salisbury, and Chichester cathedrals; Rouen and Chartres; Florence, Venice and Rome (baroque, medieval, and the Imperial forums).
I'm just adding Gloucester and Winchester Cathedrals, Gothic Barcelona, and Modernisme Barcelona. And I'm writing up Reims and Laon cathedrals for recording over the next few weeks.
Further out I'm going to be working on tours of Ghent and Bruges, and a drive-tour of "Norfolk 1450" focusing on the late medieval heritage of the county.