Nathan Laney, 6, wears a Mexican masks while visiting the Earth Echoes Children's World Museum.

Nathan Laney, 6, wears a Mexican mask while visiting the Earth Echoes Children's Museum.

Thirty children from Martial Arts Carolina visited the Earth Echoes Children’s Museum on Matthews-Mint Hill Road Thursday. The children tried on masks from around the world, played music on global instruments, made some arts and crafts, and learned about Charlotte’s seven sister cities. The Children’s World Museum features 25,000 items from around the world collected by Jerry and Sue Helms. The museum opened in early July.