St Senara's Church is the oldest building in Zennor and the most important sight in the village. The church dates mainly from the 12th century, with a sturdy granite tower added in the 15th. Inside, the carving that draws visitors is a medieval bench end showing a mermaid with a comb and mirror — the emblem of Zennor and the origin of the famous local legend.
The font is ancient and simply carved; the interior has the thick-walled, low-ceilinged darkness typical of Cornish granite churches. Look also for the squint — a narrow angled opening cut through the chancel wall, which allowed worshippers in the south transept to see the altar during mass. The churchyard has graves going back centuries and the usual cast of Cornish surnames: Treloar, Trewella, Pender. The church is usually open during daylight hours.