Gusuku Sites and Related Properties of the Kingdom of Ryukyu

Timeline

1. 12th century

   Gusuku Period begins

   Local chieftains called aji rise across the Ryukyu Islands and begin building stone fortifications on hilltops, eventually producing some 300 gusuku across Okinawa Island

2. 1322

   Sanzan Period begins

   Okinawa Island fractures into three rival kingdoms — Hokuzan in the north, Chuzan in the center, and Nanzan in the south — competing for trade and tribute

3. 1416-1422

   Zakimi Castle built

   Lord Gosamaru builds Zakimi Castle in Yomitan, including the oldest surviving stone arches in Okinawa, the prototype of later gusuku gate design

4. 1429

   Kingdom unification

   Sho Hashi of Chuzan defeats Nanzan, unifies the three principalities and founds the First Sho Dynasty with Shuri Castle as the royal seat

5. 1458

   Gosamaru-Amawari Incident

   The lords of Nakagusuku and Katsuren are eliminated in a struggle for royal power, marking the transition to a centralized monarchy

6. 1469

   Second Sho Dynasty

   A palace coup brings Sho En to the throne, founding the Second Sho Dynasty that will rule Ryukyu for the next 410 years until 1879

7. 1477

   Reign of Sho Shin

   The third king of the Second Sho Dynasty centralizes power and presides over the kingdom's peak of trade and cultural flowering across East Asia

8. 1609

   Satsuma invasion

   The Satsuma domain invades Ryukyu and turns it into a vassal of Japan while the kingdom continues paying tribute to China under a dual subordination

9. 1799

   Shikinaen completed

   The royal detached villa Shikinaen is completed, a strolling pond garden modeled on China's Eight Views of Xiaoxiang and planted with subtropical species

10. 1879

    Ryukyu disposition

    The Meiji government abolishes the Ryukyu Kingdom and incorporates it as Okinawa Prefecture, ending 410 years of the Second Sho Dynasty

11. 1945

    Battle of Okinawa

    Shuri Castle, sitting atop the Japanese 32nd Army's command bunker, is destroyed by American bombardment; Nakagusuku, Nakijin and Katsuren are heavily damaged

12. 1992

    Shuri Castle Park opens

    The reconstructed main hall is unveiled and the park opens to visitors as the symbolic centerpiece of postwar Okinawan reconstruction

13. 2000

    World Heritage inscription

    On 30 November the nine-site property is inscribed at the 24th UNESCO World Heritage Committee in Cairns as Japan's eleventh World Heritage Site

14. October 2019

    Shuri Castle fire

    An overnight electrical fire destroys the reconstructed main hall and six related buildings at Shuri Castle, 27 years after the postwar reconstruction

15. 2022

    Reconstruction restart

    Reconstruction work on Shuri's main hall resumes with completion targeted for 2026, and the on-site viewing zone becomes a new visitor attraction

Detailed History

The Gusuku Sites trace 500 years of Ryukyuan history through nine inscribed properties. The Gusuku Period (1187-1314) is the starting point: local chieftains called aji rose across the islands and built stone fortifications on hilltops, with roughly 300 gusuku eventually scattered across Okinawa Island. During the Sanzan Period (1314-1429), the island was divided into three rival kingdoms — Hokuzan in the north with its capital at Nakijin, Chuzan in the center with capitals at Urasoe and later Shuri, and Nanzan in the south — competing for tribute relations with Ming China. In 1429, Sho Hashi (1372-1439) of Chuzan defeated Nanzan, unified the island and founded the First Sho Dynasty with Shuri Castle as the royal seat. A 1469 coup brought in the Second Sho Dynasty, and under King Sho Shin (reigned 1477-1526) the kingdom reached its peak: a maritime trade network linked Naha to Ming China, Joseon Korea, Japan and Southeast Asian polities such as Siam, Malacca and Java, captured by the Bankoku Shinryo-no-Kane bell of 1458 that called Ryukyu "a bridge of all nations." The aji Gosamaru and Amawari built Nakagusuku, Katsuren and Zakimi before falling in the Gosamaru-Amawari Incident of 1458, which centralized power in the king's hands. In 1609 the Satsuma domain invaded and turned Ryukyu into a vassal of Japan while it continued paying tribute to China — a dual subordination that lasted until 1879, when Meiji Japan abolished the kingdom and renamed it Okinawa Prefecture. Shuri's main hall was designated a National Treasure in 1925, but during the Battle of Okinawa in 1945 the Japanese 32nd Army headquartered its command bunker beneath the castle, making it a primary target of American bombardment; Shuri, Nakagusuku, Nakijin and Katsuren were all heavily damaged. After Okinawa's reversion to Japan in 1972, decades of excavation and restoration followed: reconstruction of Shuri's main hall began in 1989 and the castle park opened in 1992. On 30 November 2000 the nine-site property was inscribed at the 24th UNESCO World Heritage Committee in Cairns as Japan's eleventh World Heritage Site. On 31 October 2019 an electrical fire destroyed the reconstructed main hall and six related buildings; reconstruction resumed in 2022 with the main hall targeted for 2026.

Cultural Significance

The Gusuku Sites stand as witness to a uniquely Ryukyuan culture that absorbed Chinese, Japanese and Southeast Asian influences while remaining distinct from any of them. UNESCO inscribed the property in 2000 under criteria (ii) cultural interchange, (iii) testimony to a vanished civilization, and (vi) association with beliefs. The serial of nine combines five castles (Shuri, Nakijin, Nakagusuku, Katsuren, Zakimi) with four related sites (Sonohyan-utaki Stone Gate, Tamaudun, Shikinaen, Sefa-utaki) that embody royal ritual, funerary tradition and garden culture. Sefa-utaki is the kingdom's most sacred sanctuary, the pilgrimage site for every newly enthroned king and the summit of the indigenous Niraikanai faith — a belief in a paradise across the sea wholly different from Shinto or Buddhism. Tamaudun, the mausoleum of the Second Sho Dynasty, uses the Ryukyuan hafu-baka style in white limestone, unrelated to mainland Japanese funerary architecture. Shikinaen, completed in 1799 as a royal villa, is a strolling pond garden modeled on the Eight Views of Xiaoxiang but planted with subtropical species. ICOMOS recognized that despite postwar rebuilding of wooden structures, the surviving stone walls retain high authenticity, which carried the inscription. The 2019 Shuri fire destroyed timber halls but did not threaten the heritage status, since the listing rests on the stone remains.

Architectural Details

All five castles use indigenous Ryukyuan masonry built from local Ryukyu limestone, an uplifted coral formation native to Okinawa. Three stacking techniques developed in succession: nozura-zumi (rough unworked stones, oldest method from the 13th century), nuno-zumi (rectangular blocks laid in horizontal courses, 14th century) and aikata-zumi (irregular polygonal blocks fitted without mortar in interlocking hexagonal patterns, perfected in the 15th century). Nakagusuku is the only site where all three techniques appear within a single fortification. Shuri Castle stands on the Shuri plateau at about 130 meters elevation; its reconstructed main hall, unveiled in 1992, followed the 1712 rebuild with vermilion-lacquered dragon pillars, red Okinawan roof tiles and a three-tiered Chinese palace structure — a hybrid of the Forbidden City and Japanese castles (destroyed in the 2019 fire, reconstruction targeted for 2026). Nakijin, on a 100-meter ridge in northern Okinawa, has 1.5 kilometers of stone walls and a zigzag stairway from the Heiro-mon gate to the inner enclosure. Nakagusuku, on a coastal bluff, is a six-bailey castle rebuilt by Gosamaru in the 1440s, widely considered the property's most elegant curved stonework. Katsuren occupies a 100-meter limestone hill above Kin Bay. Zakimi, built by Gosamaru in 1416-1422, preserves the oldest arched stone gates in Okinawa.