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A single white rose was placed on the tomb that said “Franciscus" — the pope's name in Latin. A light cast its warm glow over the tomb and a reproduction of the late pontiff's pectoral cross on the wall above it.

Rosario Correale, from Salerno, Italy, was among those visiting the tomb. He said he experienced "great emotion" at witnessing Francis' final resting place "I see all the people are truly moved. He has truly left a mark on us.”

People filed past, many crossing themselves or snapping photos with their phones. Ushers urged them to keep moving to accommodate the thousands who flocked to the Rome basilica to see the tomb, forming a long line outside.

“Pope Francis for me was an inspiration, a guide,” said Elias Caravalhal.

Caravalhal lives in Rome but was unable to pay his respects to Francis when the body was lying in state in St. Peter's Basilica after his death on Easter Monday at the age of 88. He said he visited the tomb “to thank him for what he has done.”

The tomb was opened on the second of nine days of official mourning for Francis, after which a conclave will be held to elect the next pope.

A special Mass was also celebrated in St. Peter's Square on Sunday by Cardinal Pietro Parolin, until recently the Vatican's secretary of state. Parolin is considered a possible contender to be the next pope due to his prominence in the Catholic hierarchy.

“The shepherd whom the Lord gave to his people, Pope Francis, has ended his earthly life and has left us,” Parolin said in his homily, delivered on the first Sunday after Easter. “The grief at his departure, the sense of sadness that assails us, the turmoil we feel in our hearts, the sense of bewilderment: We are experiencing all of this, like the apostles grieving over the death of Jesus.”

The Mass was attended by a crowd estimated at 200,000, among them many young people who originally came to Rome for what was supposed to be the canonization of the first millennial saint, Carlo Acutis, during special holy days devoted to teenagers. Many groups of youths, some in scouting uniforms, attended Francis' funeral Saturday and again filled St. Peter's Square on Sunday.

No date has yet been set for the conclave, but it is expected to start between May 5 and May 10. Cardinals who traveled to Rome for Francis' funeral will be meeting regularly this week ahead of the conclave as they start to chart a way forward for the 1.4 billion-strong Catholic Church.

Pope Francis chose his place of burial in St. Mary Major Basilica, near an icon of the Madonna that he revered, because it reflects his “humble, simple and essential" life, the archbishop who administers the basilica said Friday.

“Being able to see the pope and his tombstone today, it was really beautiful,” Amaya Morris, a tourist from Los Angeles, California, said. “I thought it was amazing that he wanted to be buried here in this basilica. Out of all of the ones, he chose this one.”