To counter this threat, Charles V ordered the construction of extensive fortifications in 1543.

Parts of the once extensive fortification are now in ruins, but visitors still sense how the fort acted as an active military outpost.

The extensive fortifications and the determination of the defenders withstood several assaults.

The extensive fortification was not typical of the period, but driven by the exposed location.

However, it was stopped three days later by another river coupled with extensive defensive fortification.

Trenčín Castle is divided into upper and lower sections, with extensive fortifications.

The island survived, although the extensive fortifications were destroyed.

These ruins were interpreted as remnants of an extensive fortification from the late Classical period.

During the war years both Soviet and Finnish troops built extensive fortifications, which are still found all over the island, along with discarded military equipment.

The church is built on top of the ruins of an extensive prehistoric fortification.