The hilltop ruins of Sendai's original castle — properly called Aobajo — are the natural vantage point over the city. Little survives beyond a stone wall section and a turret, but the elevated position offers good views east toward the coast and out across the urban sprawl. The bronze equestrian statue of Date Masamune on horseback, wearing his distinctive crescent-moon helmet, is the city's defining image.
The ruins are a 20-minute bus ride from the station or a pleasant walk uphill through the old residential neighbourhood. A small museum on-site (the Sendai City Museum is nearby) covers the castle's history and the Date clan. Come in late April or early May if possible — the hill is thick with cherry blossoms and the combination of castle walls, pink trees, and city views is exceptional.