
The boulevard is a broad, straight, tree-lined avenue cut through the urban fabric to carry movement and admit light and air, with the term originating from the wide promenades laid out on Paris's demolished ramparts in the 17th century. Its decisive modern form came with Baron Haussmann's rebuilding of Paris under Napoleon III from 1853, which drove wide new avenues through the dense medieval centre, lined with uniform stone façades and terminated by monuments. The works combined circulation, sanitation, display and military control in a single instrument.
Haussmann turned the boulevard into the tool of modern urban surgery, reorganising an entire city by cutting through it. The Parisian model of grand axes and uniform frontages was copied in cities worldwide as the image of the modern metropolis.