I made several wedding venues that are on the gallery, of various kinds to fit the different worlds we have. Not sure any of them are to your taste, but feel free to look around. The ones I am most pleased with:
Windenburg Cathedral:
https://athena.thesims.com/v2/images/1/0x00001d86/295B1216-4938-4248-BAA8-A2730EE06A4E/00.jpg
Key Point Wedding Venue: https://athena.thesims.com/v1/images/1/0x00002227/7250E0DD-B411-11ED-86EE-C73E283683F6/00.jpg
Hanamigawa Shrinehttps://athena.thesims.com/v1/images/1/0x00000542/CE81D7DF-B1C0-11ED-8329-C73E283683F6/00.jpg
But I have several others as well, the ruins in Windenburg, the Admiral's wreck, a church for Newcrest and Oakenstead for Willow Creek to name a few. There is also a wedding area in my Bothanical Garden for San Myshuno even though the lot itself is not techically a wedding venue.
I hope you find something you like.