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This is the place to search for places and things of interest to visit in Britain, by name, location, type, keyword – or just have a browse. It is a growing directory – 700+ entries as of October 2019. Most entries have links for further information.
Thames House has been headquarters of the UK's Security Service, or MI5, since 1994. Clearly, the building is not open to the public and unwanted visitors will politely be asked to leave.
From MI5's website: "The role of MI5, as defined in the Security Service Act 1989, is "the protection of national security and in particular its protection against threats such as terrorism, espionage and sabotage, the activities of agents of foreign powers, and from actions intended to overthrow or undermine parliamentary democracy by political, industrial or violent means"."