Historians often visit star forts to study their unique defensive geometry and surrounding moats.

The 17th-century star fort guarded the harbor and could withstand prolonged sieges.

The researchers visited Fort Liard to study permafrost thaw and its effects on traditional hunting grounds.

The hikers paused to rest near the ancient hill-fort, whose earthen ramparts still marked the skyline.

After the first big snowfall, the neighborhood kids worked together to build an elaborate snow fort complete with arched entrances and lookout towers.

In the manuscript, the scribe carefully marked the dagesh fortes to indicate consonant doubling.

Children spent the afternoon building snow forts in the park and then staged an epic battle.

The museum's collection of piano-fortes drew music historians from around the world.

The museum's collection includes several rare pianos-forte from the early 19th century.

She admired the delicate lines of the 19th-century eau forte hanging in the gallery.