Strange news, it’s actually illegal to take photos of the Eiffel Tower at night. Apparently doing so is in violation of the artist’s copyright, and this is stated within the FAQ section of the info printed by the company that owns the landmark.
“The views from the Eiffel Tower are rights-free. Permission and rights must be obtained from the Société d’Exploitation de la Tour Eiffel for the publication of photographs of the illuminated Eiffel Tower.”
This just refers to the blinking lights however, which were added in 1985. The actual tower is considered public domain so people are free to snap as many photos as they want during the daytime hours when the lights are off.
We’re not going to suggest that anyone to break the law here, but we will note that no one has ever been taken to court on this particular issue.