Forts, also known as strongholds or citadels, refer to a fortified structure or a place of protection. In military terms, forts are often used to provide a strategic advantage against any potential invaders. Another synonym for forts is bastions, which also emphasizes their protective and defensive value. Castles, on the other hand, are known for their grandeur and are often associated with royalty and medieval times. Fortresses are larger forts designed to withstand prolonged sieges. Fortifications are manmade structures built in order to protect an area or a territory. Finally, redoubts are small-scale fortifications or earthworks designed to reinforce a line of defense.