New Brighton, gunpowder magazine.
The entrance to the gunpowder magazine is located opposite Fort Street and runs from Magazine Lane along Magazine Brow. By the time this entrance was built in 1858, the Gunpowder Store was already being floated up River away from the increasing population of Wallasey.
Here is a link if you wish to know more:
Nikon D 7100 with a Nikon AF-S Nikkor 12-24mm 1:4 G ED
ref: 3417 - 2nd July 2020