Carrara marble

Pantheon, Trajan's Column, Column of Marcus Aurelius

Duomo

New Cathedral: ... the floor is covered with pink marble, brought from Carrara (Italy) (wiki)

The cathedral, baptistry and campanile

Pozzo del Rossellino

Pietà statue and other works of art in Musei Vaticani + Palazzo San Carlo

"facade with cubic lines covered with Carrara marble"
See fr.wikipedia.org

Catania Cathedral: "The parvise is separated from the cathedral square by a balustrade in white stone, featuring five large statues of saints in Carrara marble."
See en.wikipedia.org

Royal Pantheon

"The American cemeteries developed around the memorial, and include a chapel and a building for the manager of the site; the burials are grouped in sectors, each occupying 4 square meters. The stelae are in Carrara marble." (AB ev)

St John Co-Cathedral tombstones
See www.independent.com.mt

The Statua della Libertà on Piazza della Libertà is made of white Carrara marble.
See en.wikipedia.org

The main altar of Bayonne Cathedral (Nomination file) – Church Saint-Jacques-le-Majeur-et-Saint-Jean-Baptiste de Folleville: The recumbent figures of Raoul de Lannoy and his wife Jeanne de Poix are in Carrara marble, finely sculpted, and were considered by Léon Palustre to be "the most admirable artistic creation of northern France". (Wikipedia)
See fr.wikipedia.org

The central bank main building in Madrid has monumental stairs made out of Carrara marble.
See www.madridiario.es

The presbytery under the big dome in Padua's Duomo is completely in Carrara marble.
See it.wikipedia.org

The Rotunda

The first two flights of the stairs in the Horta House are in Carrara marble, going up the wall to the left. (Nomination file, p. 38)

The two towers are connected by two rows of Corinthian columns. The top row contains the statues of St. Dominic and St. Francis, sculpted from Carrara marble, standing in a niche on each side of the balcony. (wiki)

Sarcophagus of St. Hedwig, Queen of Poland, in Wawel Cathedral
See en.wikipedia.org

Mosque of Muhammad Ali - Muhammad Ali Pasha was buried in a tomb carved from Carrara marble, in the courtyard of the mosque (wiki)

The "Old Baths" in Baden-Baden "were constructed on the orders of Grand Duke Friedrich von Baden on the site of old Roman baths (remains are preserved in the basement area, including Augustbad, the main round basin carved from Carrara marble)." (Nomination File, p. 214)

Duomo + belfry + other churches and chapels apart from David and other statues

The statue depicting Saint Rufinus of Assisi In the right nave of the Cathedral of San Rufino is a work sculpted in Carrara marble by the Frenchman Paul Lemoyne in 1823.
See it.wikipedia.org