Why is "Gravesend Blockhouse" trending?

Wikipedia Overview

Gravesend Blockhouse was an artillery fortification constructed as part of Henry VIII's Device plan of 1539, in response to fears of an imminent invasion of England by European countries. It was built at Gravesend in Kent at a strategic point along the River Thames and was operational by 1540. A two-storey, D-shaped building built from brick and stone, it had a circular bastion overlooking the river and gun platforms extending out to the east and west. It functioned in conjunction with Tilbury Fort on the other side of the river, and was repaired in 1588 to deal with the threat of Spanish invasion, and again in 1667 when the Dutch navy raided the Thames. A 1778 report recommended alterations to the blockhouse and its defences, leading to the remodelling of the gun platforms and the construction of the new, larger New Tavern Fort alongside it. In the 1830s the government decided to rely entirely on the newer fort and the old blockhouse was demolished in 1844. Its remains were uncovered in archaeological excavations between 1975 and 1976.