The Espacio Fundación Telefónica is a vibrant cultural hub opened in 2012 in a striking 1920s telecom building. This free cultural space mixes tech, art, and innovation. Inside, find rotating digital art exhibitions, vintage phone collections, and interactive displays about communication history. The sleek industrial-style galleries often host VR experiences and future-tech showcases.

It's a hidden gem without the museum crowds and rooftop views of Gran Vía.