Newark Castle stands beside the River Clyde at Port Glasgow, close enough to Greenock to be one of the area's best historic stops. The building combines a 15th-century tower house with later mansion ranges, showing how a defensive residence became a more comfortable laird's house.
The castle is especially good for visitors interested in the Clyde before heavy industry reshaped the waterfront. Its riverside position, stone interiors, and compact scale make it an easy excursion from Greenock or a stop along the lower Clyde.