I am into architecture, churches, medieval towns.
Some items I noticed on my camino October 2017
Roncesvalles - church restored in late 1930s
Zabaldika - small church with a magnificent reredos
Pamplona -
Cizur Menor - Iglesia Sanjuanista (76 photos on Google maps)
Eunate - Church of Saint Mary of Eunate
Obanos - Iglesia de San Juan Bautista - square tower with "battlements" almost English in appearance (289 photos)
Puenta La Reina/Gares - Iglesia del Crucifijo - main entrance archway with some story telling
Cirauqui approach - what is left of a Roman bridge
Cirauqui - layout of a medieval town
Esella/Lizarra - churches in abundance
Los Arcos - Igelsia de Santa Maria - well decorated entrance archway
Torres del Rio - church with different architectural features
Viana - Igelsia de Santa Maria - "heavy" features ? Rococo/Baroque
Logrono - Parish Church of Santiago el Real (?albergue next door) gold reredos (C Barriocepo)
Logrono - modern day cathedrals - Estación de Tren e Autobuses - Av de Colon
Navarette - Iglesia Santa Maria de la Asunción - baroque - gold reredos
Najera - Parroquia de la Santa Cruz - similar external style to Torres de Rio
Azofra - church entrance with memorial to the fallen
Santo Domingo de la Calzada - Cathedral and rooster and reredos - stone with arches and bosses
Tosantos - (to north on leaving the town) Ermita de la Virgen de la Peña
Villafranca Montes de Oca plus 4 km - memorial to the fallen
Burgos - in order from Castañares to Tardajos
- Rīo Arlanzōn - path on left bank
- Parroquia San Jose obrero (parish of S Joseph, worker) - includes pilgrim hostel and large modern church (C San Pedro de Cardena)
- Museo de la Evoluciōn Humana
- Plaza Major
- Plaza de los Castaños
- Plaza de C de Lain Calvo
- Claustro de la Cathedral de Burgos - two levels (!"manuscript factory"!)
- Rīo Arlanzōn - Parque de La Isla
- Tardajos - newsish albergue
- other contributors have mentioned monastery chapel
Hontanas - newish albergue on entrance
Ruinas del Monasterio de San Antón
Castrojeriz - Collegiate Church of Santa María del Manzano and museum
Mirador del Alto de Mostelares - and 100 metre ascent in 1 km
Puente Fitero and rīo Pisuerga
Carrion de los Condes - and sloping bridge on leaving
Bercianos de Real Camino - recent church with fire station like bell tower
El Burgo Ranero - water tower - wayside cross
You might see trains to the left of you and trains to the right of you
Mansilla de las Mulas - about 1 day's walk to Monastery of San Miguel de Escalada - 14C Mazarabic monastery chapel
@santhi, that's enough from me for the moment. Most have been observed from the outside as, like the octagonal chapel at Eunate, many do not accessible most days. And the last item above is still on my bucket list - it might need a car to get there at the right time.
Good luck with your wanderings,
Kia kaha, kia māia, kia man'wa'nui (take care, be strong, patient and confident)