The Citadel, Ancient City and Fortress Buildings of Derbent were part of the northern lines of the Sasanian Persian Empire, which extended east and west of the Caspian Sea. The fortification was built ...

Québec City's Citadel (La Citadelle, in French) is the largest British-built fortress in North America; it took 30 years to construct. This military site has been active since 1850 when it housed ...

You'll need to devote a whole day to the Salah El-Din Citadel, which is quite possibly the most popular non-pyramid attraction in Cairo. This massive fortress located in Islamic Cairo was ...

Nature hides things, like this 5,000-year-old fortress that no one seemed to know about. Luckily archaeologists are uncovering its secrets.