On anothe one of our ventures, we went to the mausoleum in the south of Sendai. It's kind of in the middle of nowhere so we recommend you take the bus to get there. It's at the top of a small mountain, surrounded by the forest and hydrangeas, the landscape is simply beautiful.
A big gate guards the mausoleum with the tomb of Date Masamune safely behind it. When you go back down you can contemplate the steles of his family.
The sigil of the Kuyou family : the 9 planets