Epifanio de los Santos traveled to many places in Europe, Asia, and Americas searching for rare Philippine documents in museums, archives, and libraries. He collected almost 200 paintings and sculpted pieces done by Juan Luna, Felix Resurreccion Hidalgo, Fabián de la Rosa, Arellano, Pablo Amorsolo and Fernando Amorsolo, Nepomuceno, and Guillermo Tolentino, musical literatures, opera records, valuable printed materials, documents and manuscripts on the revolution and historical pictures. According to Zaide, his famous Filipiniana collection was rated by foreign scholars as the best in the world. In Europe, he was recognized as the philologist and writer of biographical matters about the Philippines.