People visit the Louvre Museum on its reopening day in Paris, France, July 6, 2020. After three and a half months of closure, the Louvre, one of the most visited museums in the world, reopened on Monday to the public, without lengthy queues of visitors as before the COVID-19 pandemic. (Photos: Xinhua/Gao Jing)

The pyramid of the Louvre Museum is seen on its reopening day in Paris, France, July 6, 2020. After three and a half months of closure, the Louvre, one of the most visited museums in the world, reopened on Monday to the public, without lengthy queues of visitors as before the COVID-19 pandemic.

People visit the Louvre Museum on its reopening day in Paris, France, July 6, 2020. After three and a half months of closure, the Louvre, one of the most visited museums in the world, reopened on Monday to the public, without lengthy queues of visitors as before the COVID-19 pandemic.

Visitors line up to enter the Louvre Museum on its reopening day in Paris, France, July 6, 2020. After three and a half months of closure, the Louvre, one of the most visited museums in the world, reopened on Monday to the public, without lengthy queues of visitors as before the COVID-19 pandemic.

People visit the Louvre Museum on its reopening day in Paris, France, July 6, 2020. After three and a half months of closure, the Louvre, one of the most visited museums in the world, reopened on Monday to the public, without lengthy queues of visitors as before the COVID-19 pandemic.

Visitors line up to enter the Louvre Museum on its reopening day in Paris, France, July 6, 2020. After three and a half months of closure, the Louvre, one of the most visited museums in the world, reopened on Monday to the public, without lengthy queues of visitors as before the COVID-19 pandemic.

Signs marking social distancing are seen outside the Louvre Museum in Paris, France, July 6, 2020. After three and a half months of closure, the Louvre, one of the most visited museums in the world, reopened on Monday to the public, without lengthy queues of visitors as before the COVID-19 pandemic.

Visitors wearing face masks look at the painting Mona Lisa at the Louvre Museum on its reopening day in Paris, France, July 6, 2020. After three and a half months of closure, the Louvre, one of the most visited museums in the world, reopened on Monday to the public, without lengthy queues of visitors as before the COVID-19 pandemic.

People visit the Louvre Museum on its reopening day in Paris, France, July 6, 2020. After three and a half months of closure, the Louvre, one of the most visited museums in the world, reopened on Monday to the public, without lengthy queues of visitors as before the COVID-19 pandemic.