Among the objects feared lost in the fire at Brazil's National Museum is a royal Hawaiian feather cloak that found its way to Rio centuries ago.
Hawaii Public Radio reports the Hawaiian feather cloak or ahu ula housed in the museum was a gift from King Kamehameha II (Liholiho) to the country's emperor Dom Pedro in 1824.
Liholiho was the first Hawaiian monarch to travel outside the kingdom.
He had up to five cloaks with him on his voyage. One of them was also given to England's Queen Victoria.
Ninety percent of Latin America's largest collection of treasures might have been lost in the fire.
Aerial photos of the main building showed only heaps of rubble and ashes in the parts of the building where the roof collapsed.
The vice director of the museum, Cristina Serejo, told reporters on Wednesday that several countries, including France and Germany, have offered to help with recovery and rebuilding efforts.
Serejo added that researchers could get into the museum as soon as next week, but it would depend on how soon the federal police could wrap up their investigation.