noun which may take the genitive case particle 'no', noun
free to visit; admission-free
Used for places or events that can be visited without charge or restriction. Often seen on signs or in descriptions of facilities.
この美術館は見学自由です。
This museum is free to visit.
工場見学は見学自由で、予約は不要です。
The factory tour is free and no reservation is required.
入場無料 means 'free admission' and is more common for events or venues. 見学自由 emphasizes the freedom to look around or observe, often used for tours or inspections.
Compound of 見学 (けんがく, 'observation, tour') and 自由 (じゆう, 'free, unrestricted').