place du Panthéon, 5e. Built in the form of a Greek cross with a hefty portico supported on columns and a massive dome, the Panthéon started life as a church. Imposing but dull, it was commissioned by Louis XV in recognition of St Genevieve, yet emerged from the Revolution as a receptacle for the mortal remains of great Frenchmen. Victor Hugo, Voltaire and Zola are buried in the crypt. The cupola affords panoramic views and thoughtfully provided orientation boards point out landmarks. The dome, after a multi-million euro restoration of rusting metal joints, is now considered safe.