noun
observation tower; scout tower
A tower or raised platform used for watching or scouting, historically associated with festivals, military, or fire-watching.
祭りのとき、見せ櫓から町並みを見渡した。
During the festival, we looked out over the town from the observation tower.
物見櫓 is a more common term for a watchtower or lookout tower, especially in castle contexts. 見せ櫓 is rarer and may carry a nuance of a tower for public viewing or display.
Compound of 見せ (mise, 'showing') + 櫓 (yagura, 'turret, tower'). The exact historical derivation is uncertain; the spelling 見櫓 may be a contraction.