One of the best ways to experience the City of Light is by taking the Metro. Individual tickets are easy to purchase at each station, but if you're planning on being in the city for a few days, the best option is purchasing a five-day pass. The pass costs about 60 Euros, and it covers transportation to de Gaulle Airport and Versailles.
Take a ride on the Metro and explore some of Paris' lesser known neighborhoods. Get on and off to gaze at the artwork and design of each station. With over 300 metro stations and 16 colored lines in Paris, there's plenty to see whether it's for an hour or an entire afternoon.