The Hôtel de Ville (City Hall) is situated on  the right bank of the river, just across from the eastern end of the Île de la Cité.  It contains the official apartments of the mayor of Paris. Three city  halls have stood on the site of the present building, each grander than  its predecessor. The first was the House of Pillars (Maison aux  Piliers), used by the municipality from 1357 to 1533. The present-day  Hôtel de Ville (1874–82) replaced the Renaissance structure that was in  use from the 16th century until 1871, when it was burned by the  insurrectionary Communards.
The first two buildings sat on the Place de Grève (grève  meaning “strand” or “bank”), which was the principal port of Paris for  centuries. (The refusal of boatmen to work gave the French their phrase  for going on strike: faire la grève.) The name of this square  was changed in 1830 to Place de l’Hôtel de Ville. From 1310 to 1832 it  was Paris’s principal place of execution. The second Hôtel de Ville was the focus of numerous popular uprisings, including the revolutions of 1789, 1830, and 1848 and the Commune of Paris of 1871. The current building played a prominent role during the liberation of the city from German occupation in 1944.
In July 1789, already having taken the Invalides and the Bastille,  the Revolutionary mob captured the Hôtel de Ville. Three days afterward Louis XVI  appeared on the balcony wearing a tricolour cockade (blue, white, and  red; a symbol of the Revolution) and was cheered by the crowd. The  building later was taken as headquarters for the city’s Revolutionary  government (the Paris Commune of 1792), which directed mob action to  control the National Convention,  the governing assembly of France at the time. On July 27, 1794, the  Convention’s guards entered the Hôtel de Ville and seized the radical  leader Maximilien de Robespierre and his followers; all were executed soon after. Following the July Revolution of 1830, the new king Louis-Philippe appeared on the Hôtel de Ville’s balcony and was acclaimed by the revolutionary crowd. In 1871, after Napoleon III’s defeat at Sedan during the Franco-German War,  a new French republic was declared from the steps of the Hôtel de  Ville; however, when the national government in its turn capitulated,  Parisians refused to accept defeat and in March formed the Commune of  Paris. In May national troops entered the city and fought sharp  engagements with the Communards, who set fire to the Hôtel de Ville, the  Tuileries Palace, the Palace of Justice, the Police Prefecture, the  Arsenal, and other government buildings. Approximately 20,000 Parisians  were killed during the fighting.
In  1944, as the city was being liberated from the Germans, the National  Council of Resistance (Conseil National de la Résistance) made the Hôtel  de Ville its headquarters. At the climax of the liberation, Gen. Charles de Gaulle appeared on the balcony and was acclaimed by the crowd.
 
The building is decorated with 108 statues,  representing famous Parisians. 30 Other statues represent French cities.  The clock at the central tower is adorned with several feminine  sculptures representing the Seine River, the city of Paris, 'Work' and  'Education'. The interior of the city hall is decorated in a pompous IIIe Empire style. Noteworthy are the large staircase, the long Salle des Fêtes (ballroom), the painted ceilings and walls, the stained glass windows and the numerous  chandeliers.
Text Source : britannica