Transportation in Paris is relatively easy with an extensive metro system available. A pack of 10 metro tickets costs around $20 and is valid for all zones of the city. Taxis and ride-hailing apps are also available, but can be more expensive.
If you have more time in Paris, consider visiting the Palace of Versailles, a UNESCO-listed palace with stunning gardens located just outside the city. If you have less time, skip the Catacombs of Paris and spend more time exploring the vibrant neighborhoods of Montmartre or Le Marais.