...as an author of three architecture categories I have to respond. It was not so easy for me to exclude churches from Architecture styles (Gothic, Baroque and Rennaissance), but it is not so illogical. In Europe, majority of churches was countinuously ceconstructed during centuries of their existence, so originally Romanesque church has a Gothic aisle, Rennaissance steeples, Baroque interior and facade. Rusult looks great, but discussions what style is the most important and key for this or that church are for neverending discussions. Moreover, here is good waymark - Medieval churches for "old" - it means Romanesque and Gothic churches and vast group another waymarks for resting churches. I know that it is not ideal, but I do not like putting one church into 5 categories :)
These three categories (Gothic, Baroque and Rennaissance) are primarily focused to non-sacral bulidings - because for them on Waymarking is virtually impossible to find category. These bulding are for example: chateaux - using Castle category for them is nonsense, chateaux are non-fortified representative bulidings, city palaces, burgerhouses, fortification objects, baroque columns and lot of another... So only in City of Prague we have more than 1000 objects fitting into that categories. In Europe we are discussing about thousands and thousands objetcs.
I know, that these categories are not so interestig for colleagues from USA, but for us, European are crucial... We cannot seek dozens and dozens of specifically US categories, it is no problem for us, but please, try to understand non-US waymarkers... :)
Do you know, why is Waymarking so unpopular in Europe in comparison with Geocaching...? Try to think about it from point of view of European users.
We have in the Czech Republic more than 12 000 geocaches for 78 000 sq km of our territory (so we belong to the most cachefull countries in the World), but only 700 waymarks, which are made by tiny group of way-fans... We hope, that we can change it soon, but we need some support...