Carisbrooke, Corfe, Dover, Porchester, Saltwood and Southampton Castle received cannon during the late 14th century, small circular "keyhole" gunports being built in the walls to accommodate the new weapons.
Three main gates were built in the walls – North Gate, St Martin's Gate and Sidbury Gate – protected by gatehouses of paired circular towers and arrowslits for use by crossbowmen.
In the design of a fusion reactor, cooling channels are built in the first wall of the blanket.
A bench is also built in the back wall of the cells.
Vacuum annealing of the encapsulated azafullerene results in the growth of inner tubes, however no spectroscopic signature of nitrogen built in the inner walls is detected.
During the war, extensive air raid shelters were built in the castle walls, able to hold up to 1,800 people.
In the late 14th century a watergate was built in the western walls of the city, close to a slipway for launching boats.
A ground-sourced heat pump (GSHP) was installed in a former Vicarage in Cambridgeshire, with a mix of solid wall structure built in the late 1800s and cavity wall section built in the 2000s, previously heated by oil.
The section of the wall, built in the Ming dynasty in 1381, lies in Liaoning's Suizhong county, along the border with Hebei province.
The Roman walls survive in places largely because stretches of them were incorporated into the medieval city, and the wall built in the 13th century along the Ramblas effectively hemmed it in.
