The Eiffel Tower is a beautiful landmark near the river Seine in Paris, which offers a great view over the city from the top platforms. It's definitely the most famous tourist attraction of the city.
Please be aware that the Eiffel Tower at night is protected by Copyright Tour Eiffel - Illuminations Pierre Bideau. You may use those photos for yourself, but not in a commercial context. I am not sure which size of the Eiffel Tower is relevant for this copyright, because if it's only seen in your photos as props you may be fine, even at night. Please make sure to check these things for yourself before using night photos from Paris!
photo by Manuel Becker
photo by Niko Kersting
photo by Raphaël Chekroun
photo by Julien CHIQUET
photo by Julien CHIQUET
photo by Jeff Martin
photo by Jimmy Kohar
photo by Hanaa Turkistani
photo by Manuel Becker
photo by Christian Lorenz
photo by Hanaa Turkistani
photo by Peter Iliev
The best way to get there is by Metro. You can use Bir-Hakeim station for example with only a few minutes to walk to the tower.