One of the things I like about Paris is how easy it is to get around by Métro, the subway system. Here are some resources and interesting destinations.
RATP operates the Métro and most other Paris public transportation.
RATP system maps
RATP guides and tools
Itinerary planner
Fares
t+ tickets – one-way travel for 1.90€ per ride or less
Paris Visite travel pass – valid 1, 2, 3 or 5 days for 12.00€ per day or less
Next Stop Paris app
Visiting Paris guide
best viewed on tablet or computer