The scaffold is the only edifice that revolutions do not tear down.

[L’échafaud est le seul édifice que les révolutions ne démolissent pas.]

Victor Hugo (1802–1885) French writer, journalist, human rights activist, politician

Last Day of a Condemned Man [Le Dernier Jour d’un Condamné], 1832 Preface (1829) [tr. Moncrieff (2009)]
    (Source)

(Source (French)). Other translations:

The scaffold is the only edifice which revolutions do not hurl down.
[tr. Reynolds (1840)]

The scaffold is the only edifice which revolutions do not demolish.
[tr. Fleetwood (1840)]

The scaffold is the only thing which Revolutionists do not demolish.
[tr. Ward (1896)]

The scaffold is the only construction that revolutions do not demolish.
[tr. Woolen (1992)]