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Robert McKay, an American retiree in his 80s who wore hiking boots, a safari shirt and a backpack, has explored every continent except Antarctica, and said he was thrilled at the idea of visiting pre-Hispanic ruins by rail.

“I thought to myself, if I don’t plant banyan trees, this area would become dry,” said Sadiman, wearing his trademark ranger hat and safari shirt, who goes by one name, like many Indonesians.

The pair announced they were expecting a “Baby Wildlife Warrior” last month with a photo of them holding a miniature safari shirt, which was also posted to Instagram.

Andueza, trailing behind, could have passed for Indiana Jones if he shaved his beard and picked up a whip; he wore a chocolate-brown safari shirt and a wide-brimmed waxed hat.

The program opens with Cronkite, in a short-sleeve safari shirt, standing in harsh daylight in front of Saigon ruins.