This is a detail from a chimney on the roof of the Casa Mila in Barcelona, Espania.
The small square you can see in one of the holes is a trigger to make the audio tour play in certain areas.
This is a detail from a chimney on the roof of the Casa Mila in Barcelona, Espania.
The small square you can see in one of the holes is a trigger to make the audio tour play in certain areas.