A staff member checks the sanitary condition of the Eiffel Tower in Paris, France, June 18, 2020. The Eiffel Tower will reopen on June 25. Sanitary measures have been put in place to ensure the safety of tourists. The Paris landmark has been closed for over three months due to the COVID-19 lockdown. (Xinhua/Gao Jing)

Signs about sanitary measures are set up at the ticket office of the Eiffel Tower in Paris, France, June 18, 2020. The Eiffel Tower will reopen on June 25. Sanitary measures have been put in place to ensure the safety of tourists. The Paris landmark has been closed for over three months due to the COVID-19 lockdown. (Xinhua/Gao Jing)

Signs reminding tourists of social distancing are seen at the Eiffel Tower in Paris, France, June 18, 2020. The Eiffel Tower will reopen on June 25. Sanitary measures have been put in place to ensure the safety of tourists. The Paris landmark has been closed for over three months due to the COVID-19 lockdown. (Xinhua/Gao Jing)

Signs about sanitary measures are set up at the ticket office of the Eiffel Tower in Paris, France, June 18, 2020. The Eiffel Tower will reopen on June 25. Sanitary measures have been put in place to ensure the safety of tourists. The Paris landmark has been closed for over three months due to the COVID-19 lockdown. (Xinhua/Gao Jing)

The Eiffel Tower is seen in Paris, France, June 18, 2020. The Eiffel Tower will reopen on June 25. Sanitary measures have been put in place to ensure the safety of tourists. The Paris landmark has been closed for over three months due to the COVID-19 lockdown. (Xinhua/Gao Jing)

Signs reminding tourists of social distancing are seen at the Eiffel Tower in Paris, France, June 18, 2020. The Eiffel Tower will reopen on June 25. Sanitary measures have been put in place to ensure the safety of tourists. The Paris landmark has been closed for over three months due to the COVID-19 lockdown. (Xinhua/Gao Jing)