sycamore gap in the county of northumberland, england

ancient attraction background blue border boundary britain clouds colourful countryside county cumbria england flowers fort fortification gap hadrians haltwhistle heritage hiking historic historical hood housesteads iconic lake landmark landmarks landscape milecastle military national nature northumberland outdoor park pennine prince rigg robin roman ruin rural site sky steel stone summer sunset sycamore thieves tourism tranquil travel tree vindolanda walk walking wall warm way world