Pike Hill Signal Tower - Hadrian's Wall 
“The remains of one of a network of signal towers predating Hadrian's Wall, Pike Hill was later joined to the Wall at an angle of 45 degrees.…” – official site
Ease by public transport:
Unknown
“The remains of one of a network of signal towers predating Hadrian's Wall, Pike Hill was later joined to the Wall at an angle of 45 degrees.…” – official site
Ease by public transport:
Unknown