If you're planning a trip to Paris, you'll need to know some things before you go. While you're planning your trip, here are some things to know about the most popular attractions in the city. Eiffel Tower: The Eiffel tower is the most popular attraction in Paris, drawing in nearly 7 million tourists every year. Most tourists will visit the first or second level, but you can also climb to the observation deck, Europe's highest, located on the third floor. Other attractions in Paris include Notre-Dame cathedral, which took over 200 years to build.