On April 28, 1947, the Kon-Tiki left Callao, Peru

Kon-Tiki + prestige booklet
From the Thor Heyerdahl Centenary set
Issued by Norway Post April 28, 2014
Designer: Benjamin Stenmarck

Norwegian scientist Thor Heyerdahl, along with 5 others and a parrot set off from Peru aboard a balsa logs raft. They sailed for 3 1/2 months, travelling 8,000 km across the Pacific to Tahiti. 

The crew members were Knut Haugland, Bengt Danielsson, Thor Heyerdahl, Erik Hesselberg, Torstein Raaby and Herman Watzinger.

After 101 days at sea, Kon-Tiki ran aground on a coral reef at Raroria’s atoll in Polynesia. The expedition had been an unqualified success, and Thor Heyerdahl, with his crew, had shown that South American Indians could have reached the islands of the Pacific on balsa rafts.
The Kon-Tiki expedition — Kon-Tiki Museum