This informative talk delves into the historical impact of colonialism and slavery on Barcelona's urban landscape. In the late 19th century, the city experienced an unprecedented expansion driven by wealth generated from colonies. Individuals who thrived in the Caribbean returned to invest in the city's transformation, often based on industries reliant on forced labor from enslaved individuals. The discussion aims to identify existing monuments, buildings, and public spaces that reflect this colonial legacy. Led by historian Oriol López Badell, the session includes insights from his co-edited work addressing the complexities of dealing with the colonial past. Participants will explore how invisible marks of history influence contemporary perceptions of urban spaces and foster a critical examination of our shared heritage.