The Biblioteca Virtual Miguel de Cervantes provides many kinds of links, not just to full text sites. Click on "Portales" at the top.
Biblioteca Digital Hispanica has digitized objects in all subjects, but especially in Spanish history, culture, and literature. These works include manuscripts, books, engravings, drawings, posters, photographs, and maps. Interfaces in English, Castellano, and several other dialects of Spain.
Biblioteca Virtual del Patrimonio Bibliográfico contains digital facsimiles of rare manuscript collections and early printed books, which are part of Spain's historical patrimony. It includes more than 900,000 pages and 3218 titles preserved in Spanish public libraries. The project is maintained by Spain's Ministerio de Cultura and the Comunidades Autonomas.
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