(250519) -- TORONTO, May 19, 2025 (Xinhua) -- Visitors look at a sheet of copper flecked with rock at the Royal Ontario Museum in Toronto, Canada, May 18, 2025.

Opened in 1914, the museum is home to a world-class collection of 18 million artworks, cultural objects and natural history specimens.

International Museum Day, observed every year on May 18, is a global celebration recognized by the International Council of Museums. (Photo by Zou Zheng/Xinhua)