Poland in photo riddles - part 3

Have you visited it? I have several times. About 20 yers ago, the security people there used to let you have a look through the window. Now it's restored and looks really good.

Nope, I saw it first time in an article about Warsaw. I would have never guessed what it was.

It's different to the UK ones which were mostly metal and used to be lowered in the evening so they didn't interfere with TV reception. When I first saw that structure, I thought it was a tram shed which were usually brick and round.

The vintage tram sheds which I saw in cities in Poland were always like blocks.

Łódź

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Which is it, brick or block ?