This is a weird, though fairly interesting? Proposal. It's been quite a long time since I was in Sigüenza, plus this is supposed to be a cultural landscape and I've only been to one town, but seeing that there's no reviews and that It's pretty remote i'll add mine.
So...for those Who don't know Sigüenza IS a classic touristic medieval town in Spain. Wonderfully preserved with some interesting monuments. I especifically recall a mudejar House which I found somewhat remarkable and the Cathedral which is quite good.
The reasoning for the inscription seems to point in the direction of "filling a void". You see, there's a lot of WHS which can be describes as: central European medieval town along Major river. The state argues that this is different because the Rivers are minor and the "small medieval town along a small River valley" is not well represented in the list. Take that as you Will 🤷♂ï¸
Overall I was very surprised when this site was proposed. It had never ocurred to me, but noticing the increadible ability of Spain (along Italy and Germany) to get very dubious sites into the list, i wouldn't be too surprised if this ends up inscribed. Mostly because Sigüenza is charming, well preserved, sufficiently different to make a point and, with a heavy dossier, It seems to actually bring a couple things to the table. Nevertheless i didn't grasp any OUV when I went.
For those Who want to see the site. I'm pretty sure this is one of those you must vist by car. Sigüenza is already remote, though you can fortunately go by train. Howvere the many villages around It must be almost unaccesible by public transport.