Grianan of Aileach: Hillfort of a Legendary Kingdom Which Lies on 5000-Year-Old Sacred Groundhttps://www.ancient-origins.net/ancient-places-europe/grianan-aileach-hillfort-legendary-kingdom-which-lies-5000-year-old-sacred-021295

Exterior of the fort showing the entrance. By VisionsofthePast

Interior view of tiered wall and steps of Grianan of Aileach, Donegal, Ireland.

Grianan of Aileach on the equinox

Overlooking Inch Island from the "Grainan of Aileach" ancient stone ring fort, Donegal, Ireland Gareth Wray

The Well of St Patrick south of Grianan

Exterior of the fort showing the entrance. By VisionsofthePast

Interior view of tiered wall and steps of Grianan of Aileach, Donegal, Ireland.

Grianan of Aileach on the equinox

Overlooking Inch Island from the "Grainan of Aileach" ancient stone ring fort, Donegal, Ireland Gareth Wray

The Well of St Patrick south of Grianan