noun
Used for going out to see sights, often in compounds like 物見遊山 (ものみゆさん).
週末は物見がてら、隣町まで歩いてみた。
On the weekend, I walked to the next town while doing a bit of sightseeing.
They sent out scouts to observe the enemy's movements.
noun
A high place or structure used for keeping watch, especially in castles or fortifications.
城の物見から遠くの海が見渡せた。
From the castle's watchtower, you could see the distant sea.
Compound of 物 (もの, thing) and 見 (み, seeing). The meaning 'sightseeing' is straightforward; the military senses developed from the idea of 'watching things' for observation or reconnaissance.