Asked if he thought Iraq was ready for tourists, Mr. Yacoub said, “No.” When he was asked if he believed Falluja was safe for tourists, his emphatic “no” was echoed by staff members and guests standing within earshot.

But there was no stopping Mr. Marchio. For an extra $40, the hotel gave him a tour of Baghdad sights, driving him along the riverfront, where he could photograph a statue of Scheherazade, the narrator of “The Thousand and One Nights,” and see children playing in a riverside garden. He proceeded to the artificial lake near Baghdad University and then to the square named after Baghdad’s founder, Abu Jaafar al-Mansur, on the west bank of the Tigris.

He went on to Zawra’a Park, a family spot with a small zoo and rides. He finished his day in the affluent but bomb-scarred shopping district of Karada, where his guide for the day, Ramez Fa’eq, 23, said, “When it became dark, he got afraid and wanted to return home to the hotel.”

The next morning he set out for Falluja despite the hotel staff’s efforts to dissuade him, insisting on taking a public bus to the city, 40 miles west of Baghdad.

Within hours, the hotel staff received a call from the Falluja police. “I wasn’t surprised when they called,” Mr. Yacoub said. The police told him that they had found Mr. Marchio in a minibus next to a woman who sold fresh milk, yogurt and cream door to door. “They were very worried about him,” Mr. Yacoub said.

For the eager Mr. Marchio, that was the end of his bel viaggio in Iraq.

The police summoned local Iraqi journalists to tell them of the wandering Italian, American marines were called in, the Italian Embassy was notified. The police concluded that Mr. Marchio was not an Italian jihadist and was a risk to no one but himself. An American marine working with the police suggested taking him to the city limits and dropping him where Falluja met the main highway.

“I explained to him that it was not safe to move around,” said Renato Di Porcia, the deputy chief of mission at the Italian Embassy in Baghdad. “He is a little bit naïve.”