Photo: Plflcn, CC BY-SA 4.0 via Wikimedia Commons
It is not accessible, but since it is 207 m high with 50 floors you can see it from far away. Designed by Arata Isozaki.
Allianz Tower, also known as Isozaki Tower and il Dritto, is a 50-floor, 260-metre-tall (850 ft) skyscraper in Milan, Italy. Designed by Japanese architect Arata Isozaki and Italian architect Andrea Maffei, it serves as the headquarters of the Italian subsidiary Allianz SpA.
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An office building hosting the business magazine Sole 24 Ore and an example of modern Italian architecture.
Porta Sempione
The triumphal arch of peace stands at the place at one of Milan's seven city gates. First the gate was known as Porta Giovia and was closer to the city center. Porta Sempione means "Gate towards Simplon", and once the road leading over the Simplon Pass to Paris went through this gate. The current gate was built in the early 19th century and at that time it was referred to as Arco della Pace.
Branca tower
The tower is 108 m high built in 1933 and designed by architect Giò Ponti. From here you can get good views over Milan.