Hardknott Roman Fort interior looking west along the Eskdale Valley to the Solway Firth, South Lakes, Lake District National Park, Cumbria, England, United Kingdom, Europe

The view from Yew Crags near Hardknott Roman Fort in the west of the Lake District National Park, Cumbria, England, United Kingdom, Europe

Late evening light on the Scafells from above Hardknott Fort, Lake District National Park, Cumbria, England, United Kingdom, Europe

Detail of stonework in the walls, Hardknott Roman Fort, Cumbria, England, United Kingdom, Europe

Hardknott Roman Fort, Hardknott Pass, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Hardknott Pass in Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Hardknott Roman Fort, Hardknott Pass, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Hardknott Pass, Lake District National Park, Cumbria, England, UK

Hardknott Pass, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Hardknott Pass, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Hardknott Pass in Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Hardknott Roman fort, Cumbria, England, United Kingdom, Europe

The sun setting over the Irish Sea from Hardknott Pass, in the Lake District, Cumbria, England, United Kingdom, Europe

A car descending Hardknott Pass in the Lake District, Cumbria, England, United Kingdom, Europe

A phone box at Brotherilkeld in Eskdale, Lake District, Cumbria, England, United Kingdom, Europe

Hardknott Roman Fort on Hardknott Pass in the Lake District, Cumbria, England, United Kingdom, Europe

A temperature inversion at sunset over Eskdale in the Lake District National Park, Cumbria, England, United Kingdom, Europe

Scafell Pike from Hardknott Roman Fort in the Lake District, Cumbria, England, United Kingdom, Europe

Hardknott Roman Fort on Hardknott Pass in the Lake District, Cumbria, England, United Kingdom, Europe

Road signs on Hardknott Pass in the Lake District, Cumbria, England, United Kingdom, Europe

A temperature inversion at sunset over Eskdale in the Lake District National Park, Cumbria, England, United Kingdom, Europe