真宗大谷派名古屋別院の中に古渡城の標柱と説明板があります。東本願寺内に碑があります大須観音から西本願寺経由で歩いてみたが仏壇屋ばかり、地下鉄東別院近くで駐車場あり。

The Higashi-honganji temple is near the Higashibetuin subway station.
I walked from Oosu-Kannon to this temple.
It is a long distance.
There were many Buddhist family altar shops along the road.
The old days were the ruins of a castle (around this temple).
There is an explanation board at the side of big-bell.