People watch archaeological discoveries exhibited at the South African Museum in Cape Town, South Africa, on May 18, 2021. The South African Museum opened to visitors for free on Tuesday, which marked this year's International Museum Day. Founded in 1825, the museum houses a vast historical and natural collection, including over 1.5 million specimens of scientific importance. (Photos: Xinhua)

People visit the South African Museum in Cape Town, South Africa, on May 18, 2021. The South African Museum opened to visitors for free on Tuesday, which marked this year's International Museum Day. Founded in 1825, the museum houses a vast historical and natural collection, including over 1.5 million specimens of scientific importance.

People visit the South African Museum in Cape Town, South Africa, on May 18, 2021. The South African Museum opened to visitors for free on Tuesday, which marked this year's International Museum Day. Founded in 1825, the museum houses a vast historical and natural collection, including over 1.5 million specimens of scientific importance.

Photo taken on May 18, 2021 shows specimens of animals exhibited at the South African Museum in Cape Town, South Africa. The South African Museum opened to visitors for free on Tuesday, which marked this year's International Museum Day. Founded in 1825, the museum houses a vast historical and natural collection, including over 1.5 million specimens of scientific importance.

Photo taken on May 18, 2021 shows bones of a whale exhibited at the South African Museum in Cape Town, South Africa. The South African Museum opened to visitors for free on Tuesday, which marked this year's International Museum Day. Founded in 1825, the museum houses a vast historical and natural collection, including over 1.5 million specimens of scientific importance.

Photo taken on May 18, 2021 shows specimens of animals exhibited at the South African Museum in Cape Town, South Africa. The South African Museum opened to visitors for free on Tuesday, which marked this year's International Museum Day. Founded in 1825, the museum houses a vast historical and natural collection, including over 1.5 million specimens of scientific importance.