November 2018 - Madrid Spain
There are several entrances to the park.
One of the most iconic buildings in Madrid, the Crystal Palace is made almost entirely of glass. Enter the building to see the sunlight streaming in through the solid glass panes and admire the art exhibitions that are changed out seasonally. The building is surrounded by a small lake where terrapins, frogs and ducks all live together.
I couldn't find a name for this building.
A sentry box.