The Eiffel Tower was closed Tuesday as part of a nationwide day of strikes called in France to protest government-led labour reforms, the landmark's operator said.
Some of its personnel was taking part in the day of action called by labour unions, the company said, and there were not enough people to open the monument.
The closure was just one of a number of disruptions expected over the course of the day due to the strikes, which the leader of umbrella union CGT, Philippe Martinez, said would be the biggest day of action yet.
France has seen strikes and demonstrations for months over proposed labour regulation reforms that went in front of the Senate on Monday.
The reforms are aimed at making it easier for companies to dismiss employees and changing the way union-company negotiations are handled.