A five-storey house on Plaza Lope de Vega that measures just 107 centimetres across its narrow façade — one of the skinniest buildings in Europe. The neighbours behind it are wider, but the street-facing wall is essentially a slice of a much deeper building, an architectural oddity left over from a complicated medieval property division.
The interior is private and not open to visitors. Look at it from outside on the small square between the cathedral and the Plaza de la Reina; the locals are used to people stopping to count storeys.