Fortifications are militaryconstructions designed for defensivewarfare. They have been used for many thousands of years, in a variety of increasingly complex designs. The practice of improving an area's defense is also known as "fortification". Many military installations are known as forts, although they are not always "fortified".
... Railway, the City and South London Railway and Underground Electric Railways of London) are now closed and, for the most part, abandoned.
Aldwych tube station
Blake ...