Iswari Minar Swarga Sal is a tall minaret in Jaipur's old walled city. The climb is the point: from the top you get a tight view over the Pink City grid, with bazaars, palace walls, and the Aravalli hills lining up in a way that is harder to grasp from street level.
It is close to the City Palace and Jantar Mantar, so it fits easily into a walk through central Jaipur. The stairs are narrow, but the payoff is one of the better quick viewpoints in the old city.