Suyangsan Fort
Mountain fort with 8 km long walls. It was built approximately 1000 years ago and its walls are 6 – 7 m tall.
Hwangryong Fortress
Ruins of an impressive fortress, developed in the time period from the early 5th century AD to 1675. Walls are 10 – 11 m high, 6 – 8 m wide and have a circumference of 6.6 km. Most of the walls are built on the mountain ridges.
Chongbang Fortress (Jŏngbang)
Ruins of an enormous mountain fortress that was built to protect Pyongyang some millenia ago. Reconstructed in 1632. 12 km long walls that are 6 – 10 m high. Includes Songbulsa temple.
Samnyeon sanseong
Ruins of an enormous mountain fortress that was constructed in 470 – 473 AD. The measured length of walls is 1,680 – 1880 m and they were 13 – 20 m tall.
Namhansanseong
Well preserved, impressive mountain fortress that now is adorned with parks and temples. The first known fortress was built here in 672 AD. Current structures have been constructed mainly in the 17th – 18th century. Since 1954 here is a park with fine views of Seoul.
Geumjeongsanseong
Largest mountain fortress in South Korea. Fortress was built in 1703 and its walls were some 17 km long, 1.5 – 3 m tall.
Dongnae eupseong
Ancient fortress of Busan city, first mentioned in 1021 AD. Fortress was extended in 1713 – then the length of walls reached 5,240 m.
Fort of São Tiago
This fort was built at the seaside in the 16th – 17th century and is preserved in a very good state.
Fort of Pico (Fortaleza de São João Baptista do Pico)
One of the most impressive fortresses on the island, built to protect Madeira from pirates. Construction was started around 1601 and lasted until 1640. Impressive is the enormous water tank cut in the cliff.
Hoa Lư Citadel
Citadel of the medieval capital of Vietnam, founded in the 10th century AD. Citadel was located among steep limestone pinnacles and was protected by some 10 m tall and up to 15 m thick earthen ramparts. Nowadays some parts of these ramparts and some temples remain.