Diên Khánh Citadel

Diên Khánh Citadel, front gate

French built fortification that has been preserved in a very good condition. Built in 1793 in Vauban military architecture style.

Cổ Loa Citadel

A house in Cổ Loa Citadel

Oldest fortification in Hanoi, fortified citadel 20 km north from the center of the city. Development of this fortress started around 400 – 350 BC, outer walls have a perimeter of 8 km. Remaining ramparts are up to 12 m high. Cổ Loa town is located inside the ramparts up to this day.

Citadel of the Hồ Dynasty

Citadel of Ho Dynasty, north gate

Ruins of a large fortification built in the early 15th century by Hồ Dynasty. Fortification walls enclose a rectangular area, the outer side of walls is 870.5 by 883.5 m large. The complex was built according to feng-shui (geomantic) principles – one of the first applications of this philosophy in the city planning in this part of Asia.

Củ Chi tunnels

One of entrances in Củ Chi tunnels, Vietnam

121 km long system of tunnels and underground rooms created for defensive purposes in the late 1960s – 1970s.

Østerlars Church, Bornholm

Østerlars Church, Bornholm

Largest of the four round churches in Bornholm. Constructed in Romanesque style around 1160, served also as a fortification. The enormous central column is adorned with medieval frescoes. Round churches of Bornholm are subject to modern legends about Templars and Holy Grail.

Gorakhgad hill fort

Gorakhgad cliff, Maharashtra

A nearly inaccessible medieval Maratha hill fort with remnants of fortifications, rock-cut steps.