Allianz Tower

This guide to the Allianz Tower in Milan starts inside a hidden fire-stair nobody is meant to want to climb, where in 2019 hundreds of Allianz employees and volunteers, working with the street-art collective Orticanoodles, spent months painting a different world city on every flight. It also follows architects Arata Isozaki and Andrea Maffei, who borrowed a stacking idea from sculptor Constantin Brancusi to give the fifty-floor glass tower its billowing, repeating shape. Look for the four gold braces near the base that quietly keep the slender building steady in the wind.