Dun Troddan is one of two brochs located close to each other in the valley of Gleann Beag, near the village of Glenelg. Each was built around 2,000 and 2,500 years ago.

A Broch is an Iron Age structure designed to both impress and defend. Their general layout comprised two concentric stone walls with a stairway or access within the walls to the upper floors. This would have been easily defensible for an extended family and their livestock.