"Conferencias Aula Abierta:
De maceta a rascacielos. El hormigón armado, la invención de un material. November 07, 2014, 12 p.m."
Mercedes López García. Profesora titular de Estética de la Ingeniería de la Universidad Politécnica de Madrid.

A really interesting conference.
link

Some investigations have led experts to assess that G. Eiffel designed a steel truss bridge in Asturias: the "Parana" Viaduct in the railway from Lena to Pajares.

The story ended in 1954, when someone decided that the bridge was no longer available for the new convoyes...

More information:
http://elblogdeacebedo.blogspot.com.es/2014/08/el-problema-del-puente-arroyo-parana.html