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The guillotine
On the Île de la Cité, the oldest part of Paris, we find La Conciergerie, a palace that became a jail during the Revolution and was home to the dreaded guillotine. At its height of use, this Gothic structure housed 2,600 inmates.
The building was renovated in the 19th century and now hosts concerts and wine tastings. The facade features a 14th-century clock tower. The nearest Metro stop is Cité. Remember that it's closed on holidays.