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보은 삼년산성 · Chungcheongbuk-do
The official closing-day note can't be read as a fixed rule, so we mark it “check before visiting”.

Photos: Korea Tourism Organization (KOGL Type3), shown unaltered.
| Mon | 9:00–18:00 |
|---|---|
| Tue | 9:00–18:00 |
| Wed | 9:00–18:00 |
| Thu | 9:00–18:00 |
| Fri | 9:00–18:00 |
| Sat | Closed |
| Sun | Closed |
| Holiday | Not listed — call ahead |
충청북도 보은군 보은읍 뱃들로 20
| Mon | 8:30–18:30 |
|---|---|
| Tue | 8:30–18:30 |
| Wed | 8:30–18:30 |
| Thu | 8:30–18:30 |
| Fri | 8:30–18:30 |
| Sat | 8:30–16:00 |
| Sun | Closed |
| Holiday | Not listed — call ahead |
충청북도 보은군 보은읍 남부로 4523
| Mon | 8:30–18:30 |
|---|---|
| Tue | 8:30–18:30 |
| Wed | 8:30–18:30 |
| Thu | 8:30–18:30 |
| Fri | 8:30–18:30 |
| Sat | 8:30–13:00 |
| Sun | Closed |
| Holiday | Not listed — call ahead |
충청북도 보은군 보은읍 남부로 4513 (보은읍)
| Mon | 8:30–18:00 |
|---|---|
| Tue | 8:30–18:00 |
| Wed | 8:30–18:00 |
| Thu | 8:30–18:00 |
| Fri | 8:30–18:00 |
| Sat | 9:00–12:30 |
| Sun | Closed |
| Holiday | Not listed — call ahead |
충청북도 보은군 보은읍 삼산남로 8,
Source: Korea Tourism Organization open API (modified listing as published). Hours can change without notice — please check the official website or call before visiting.