Washington, DC is a strange place, unlike other American cities in many ways. It is, for one thing, comparatively flat: because of a 1910 edict prohibiting the construction of anything exceeding 130ft, the Capitol building and the Washington Monument tower over everything else in the city’s core. With its wide avenues and its grandly imposing government buildings, it explicitly recalls its imperial predecessors – Rome, London, Vienna, Paris – but is really nothing like those places. Unlike these old European abodes of power, Washington radiates the live aura of hegemony: a power which is everywhere evoked and yet insistently obscure....