Education in the 21st century has moved towards digital learning to offer high quality programmes that meet the technological and communicative demands of today's society. Well-known approaches such as Content and Language Integrated Learning (CLIL) and English as a Medium of Instruction (EMI) may benefit from this new reality by addressing linguistic and cognitive challenges in written discourse. This paper examines the written performance of forty first-year undergraduate students coursing a CLIL module in History of the Classical World at a Spanish university. By means of Google My Maps, participants were expected to create a custom map describing five Roman vestiges of their choice. The findings indicate that students' L1 negative transfer may lead to grammatical and lexical inaccuracy. Google My Maps has proved to be a valid resource for the retention of History contents as well as for the acquisition of a foreign language in online learning environments.