Glenveagh
A glaciated glen in the Derryveagh Mountains with a castle on its lake — Donegal wilderness carrying the memory of the evictions that emptied it.
Glenveagh is built around a single geological gesture: a fault-line glen sliced straight through the Derryveagh Mountains, floored by Lough Veagh and walled steeply enough that the road in feels like entering a keep. The park's roughly 170 square kilometres of granite upland, bog and oakwood make it the wildest large tract in the northwest, with Errigal's quartzite cone standing just beyond the boundary and the Poisoned Glen opening off its shoulder.
Its human history is the dark twin of its scenery. John George Adair assembled the estate in the 1850s and in 1861 evicted all 244 tenants in the Derryveagh evictions — a clearance remembered in Donegal to this day — then built Glenveagh Castle as a picturesque battlemented lodge on the lakeshore. Later owners were gentler: Henry McIlhenny of Philadelphia perfected the castle's gardens — subtropical borders improbably lush at 55° north — and the estate passed to the state to become a national park in the 1980s. The glen now hosts one of Ireland's largest red deer herds, and it was here that golden eagles were reintroduced to Ireland in 2001, hatching the country's first wild chicks in a century.
What's worth knowing before you go
The visitor centre sits at the north end of Lough Veagh, about twenty minutes from Letterkenny via Churchill; private cars stop there, and a shuttle bus or a flat lakeside walk of four kilometres covers the rest of the way to the castle. The garden and castle tour is genuinely worth the time even for the walking-boots contingent.
Beyond the castle the crowds vanish instantly: the path on to the Astelleen waterfall and the glen's upper reaches is quiet even in August. October is the insider's month — rut season, when the stags' roaring rolls off the glen walls at dawn and the birches turn against the dark granite.