Part of an artillery fort built in 1627 has been discovered near to the docks in Hull.
Many items have been found at the site
The South Battery once formed part of the city's defences but it has not been seen since it was demolished around 1855.
Archaeologists working next to the old Central Dry Dock in Humber Street have uncovered the remains of three of the Battery's gun positions.
Pottery has also been found as well as a collection of clay tobacco pipes.
Dave Evans from the Humber Archaeology Partnership said: "This is a tremendously important discovery for the city.
"It is of major regional, and even national, importance for our understanding of the development of artillery fortifications.
"Finding the remains of the South Battery so well-preserved under the later concrete of the dock structures has been a real treat."