Open to visitorsa Historic Environment Scotland site — many are free to wander; staffed ones charge and keep set hours
Substantial ruinsruined, but plenty survives above ground
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Newark Castle, Port Glasgow is one of two castles the Albion Guide charts in Inverclyde. The site is in the care of Historic Environment Scotland. Kilmahew Castle and Duchal Castle are among the castles within 6 km. The nearest railway station, Port Glasgow, is under a kilometre away.