Piccaddilly Line, 1907-1994.
Aldwych would have been the terminus of the Piccadilly line to Holborn and would have seen the Brompton & Piccadilly Circus and the Great Northern & Strand lines (which were never built) passing through it. It closed due to low passenger usage and the high cost of replacing its lifts. Nowadays, its platforms are occasionally used for filming.
5. City Road.
Northern line, 1901-1922.
Located between Old Street and Angel, City Road closed when there was a roof collapse at Elephant &Castle and the entire line stopped working. It wasn’t rebuilt due to low passenger use, but its ventilation tower remains.
12. King William Street.
Northern line, 1890-1900.
King William Street closed because it was so popular that Stockwell, the tube at the other end of the line, was too small to cope with the high volume of passengers coming into it. Its underground platforms were used as air raid shelters during the war.
19. Osterley Park & Spring Grove.
Piccadilly line, 1883-1934.
Osterley Park & Spring Grove was abandoned when Osterley station was built to its south-west, in order to provide additional capacity. Nowadays a bookshop inhabits the space where it used to be.
20. Park Royal & Twyford Abbey.
Piccadilly line, 1903 - 1931.
Park Royal & Twyford Abbey was initially opened to allow people to access the Royal Agricultural Show but was closed when the station was relocated to Park Royal to provide more convenient access.
27. York Road.
Piccadilly line, 1906-1932.
This station was closed because it was financially unsustainable and increased journey time between Finsbury Park and King’s Cross too significantly. However, the building is still visible between King’s Cross and Caledonian Road.
H/t Abandoned Stations.