Scaffolding inside the dome of St. John's Baptistery, one of the oldest churches in Florence, central Italy, Tuesday, Feb. 7, 2023. The Baptistery's dome is undergoing a restoration work that will be done from an innovative scaffolding shaped like a giant mushroom that will stand for the next six years in the center of the church, and that will be open to visitors allowing them for the first and perhaps only time, to come come face to face with more than 1,000 square meters of precious mosaics covering the dome. (AP Photo/Andrew Medichini)

Restorers Chiara Zizola, right, and Roberto Nardi work at the restoration of the mosaics that adorn the dome of one of the oldest churches in Florence, St. John's Baptistery, in Florence, central Italy, Feb. 7, 2023. The restoration work will be done from an innovative scaffolding shaped like a giant mushroom that will stand for the next six years in the center of the church, and that will be open to visitors allowing them for the first and perhaps only time, to come come face to face with more than 1,000 square meters of precious mosaics covering the dome. (AP Photo/Andrew Medichini)

People walk past St. John's Baptistery, one of the oldest churches in Florence, central Italy, Tuesday, Feb. 7, 2023. The Baptistery's dome is undergoing a restoration work that will be done from an innovative scaffolding shaped like a giant mushroom that will stand for the next six years in the center of the church, and that will be open to visitors allowing them for the first and perhaps only time, to come come face to face with more than 1,000 square meters of precious mosaics covering the dome. (AP Photo/Andrew Medichini)

Technicians work at the restoration of the mosaics that adorn the dome of one of the oldest churches in Florence, St. John's Baptistery, in Florence, central Italy, Tuesday Feb. 7, 2023. The restoration work will be done from an innovative scaffolding shaped like a giant mushroom that will stand for the next six years in the center of the church, and that will be open to visitors allowing them for the first and perhaps only time, to come come face to face with more than 1,000 square meters of precious mosaics covering the dome. (AP Photo/Andrew Medichini)

A detail of the mosaics that adorn the dome of one of the oldest churches in Florence, St. John's Baptistery, in Florence, central Italy, Tuesday, Feb. 7, 2023. The Baptistery's dome is undergoing a restoration work that will be done from an innovative scaffolding shaped like a giant mushroom that will stand for the next six years in the center of the church, and that will be open to visitors allowing them for the first and perhaps only time, to come come face to face with more than 1,000 square meters of precious mosaics covering the dome. (AP Photo/Andrew Medichini)

Restorer Chiara Zizola checks the consistency of the mosaics that adorn the dome of one of the oldest churches in Florence, St. John's Baptistery, in Florence, central Italy, during its restoration works, Tuesday Feb. 7, 2023. The restoration work will be done from an innovative scaffolding shaped like a giant mushroom that will stand for the next six years in the center of the church, and that will be open to visitors allowing them for the first and perhaps only time, to come come face to face with more than 1,000 square meters of precious mosaics covering the dome. (AP Photo/Andrew Medichini)

A detail of the mosaics that adorn the dome of one of the oldest churches in Florence, St. John's Baptistery, in Florence, central Italy, Tuesday, Feb. 7, 2023. The Baptistery's dome is undergoing a restoration work that will be done from an innovative scaffolding shaped like a giant mushroom that will stand for the next six years in the center of the church, and that will be open to visitors allowing them for the first and perhaps only time, to come come face to face with more than 1,000 square meters of precious mosaics covering the dome. (AP Photo/Andrew Medichini)

Restorers Chiara Zizola, top, and Roberto Nardi work at the restoration of the mosaics that adorn the dome of one of the oldest churches in Florence, St. John's Baptistery, in Florence, central Italy, Tuesday Feb. 7, 2023. The restoration work will be done from an innovative scaffolding shaped like a giant mushroom that will stand for the next six years in the center of the church, and that will be open to visitors allowing them for the first and perhaps only time, to come come face to face with more than 1,000 square meters of precious mosaics covering the dome. (AP Photo/Andrew Medichini)

A view of Florence, central Italy, as seen from Michelangelo's square, Tuesday, Feb. 7, 2023. Florence's St. John's Baptistery's dome is undergoing a restoration work that will be done from an innovative scaffolding shaped like a giant mushroom that will stand for the next six years in the center of the church, and that will be open to visitors allowing them for the first and perhaps only time, to come come face to face with more than 1,000 square meters of precious mosaics covering the dome. (AP Photo/Andrew Medichini)

Technicians take photos during the restoration work of the mosaics that adorn the dome of one of the oldest churches in Florence, St. John's Baptistery, in Florence, central Italy, Tuesday Feb. 7, 2023. The restoration work will be done from an innovative scaffolding shaped like a giant mushroom that will stand for the next six years in the center of the church, and that will be open to visitors allowing them for the first and perhaps only time, to come come face to face with more than 1,000 square meters of precious mosaics covering the dome. (AP Photo/Andrew Medichini)

People look at St. John's Baptistery, one of the oldest churches in Florence, central Italy, Tuesday, Feb. 7, 2023. The Baptistery's dome is undergoing a restoration work that will be done from an innovative scaffolding shaped like a giant mushroom that will stand for the next six years in the center of the church, and that will be open to visitors allowing them for the first and perhaps only time, to come come face to face with more than 1,000 square meters of precious mosaics covering the dome. (AP Photo/Andrew Medichini)

Visitors admire St. John's Baptistery, one of the oldest churches in Florence, central Italy, Tuesday, Feb. 7, 2023. The Baptistery's dome is undergoing a restoration work that will be done from an innovative scaffolding shaped like a giant mushroom that will stand for the next six years in the center of the church, and that will be open to visitors allowing them for the first and perhaps only time, to come come face to face with more than 1,000 square meters of precious mosaics covering the dome. (AP Photo/Andrew Medichini)

A detail of the mosaics that adorn the dome of one of the oldest churches in Florence, St. John's Baptistery, in Florence, central Italy, Tuesday, Feb. 7, 2023. The Baptistery's dome is undergoing a restoration work that will be done from an innovative scaffolding shaped like a giant mushroom that will stand for the next six years in the center of the church, and that will be open to visitors allowing them for the first and perhaps only time, to come come face to face with more than 1,000 square meters of precious mosaics covering the dome. (AP Photo/Andrew Medichini)

Restorers Chiara Zizola, right, and Roberto Nardi work on the restoration of the mosaics that adorn the dome of one of the oldest churches in Florence, St. John's Baptistery, in Florence, central Italy, Tuesday Feb. 7, 2023. The restoration work will be done from an innovative scaffolding shaped like a giant mushroom that will stand for the next six years in the center of the church, and that will be open to visitors allowing them for the first and perhaps only time, to come come face to face with more than 1,000 square meters of precious mosaics covering the dome. (AP Photo/Andrew Medichini)

Visitors admire St. John's Baptistery, one of the oldest churches in Florence, central Italy, Tuesday, Feb. 7, 2023. The Baptistery's dome is undergoing a restoration work that will be done from an innovative scaffolding shaped like a giant mushroom that will stand for the next six years in the center of the church, and that will be open to visitors allowing them for the first and perhaps only time, to come come face to face with more than 1,000 square meters of precious mosaics covering the dome. (AP Photo/Andrew Medichini)

Technicians work on the restoration of the mosaics that adorn the dome of one of the oldest churches in Florence, St. John's Baptistery, in Florence, central Italy, Tuesday Feb. 7, 2023. The restoration work will be done from an innovative scaffolding shaped like a giant mushroom that will stand for the next six years in the center of the church, and that will be open to visitors allowing them for the first and perhaps only time, to come come face to face with more than 1,000 square meters of precious mosaics covering the dome. (AP Photo/Andrew Medichini)