“Vitoria-Gasteiz 1850: a virtual reconstruction” is an application for general use on mobile devices developed by Arkikus (www.arkikus.com) and commissioned by the Town Council of Vitoria-Gasteiz (www.vitoria-gasteiz.org/turismo). The virtual reconstruction included in this app aims to show the architectural atmosphere that the town of Vitoria-Gasteiz (Basque Country, Spain) showed in 1850, before the demolition of the gateways that protected the medieval walls and its subsequent modernisation.