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Which parts of Rome did Pope Nicholas V rebuild or restore?

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Montúfar, Antonio: Saint Francis of Assisi Appearing Before Pope Nicholas V, with Donors — Nicholas V *Saint Francis of Assisi Appearing Before Pope Nicholas V, with Donors*, oil on canvas by Antonio Montúfar, 1628; in the Los Angeles County Museum of Art. 107.95 × 87.63 cm.

Pope Nicholas V initiated an ambitious program to restore and rebuild various architectural landmarks in Rome to establish the city as a worthy center of Christianity. His efforts included:

St. Peter’s Basilica: He planned to build a new church but was primarily able to rebuild sections that were crumbling.1
Vatican Palace: He undertook the reconstruction of the palace and surrounded the entire complex with a wall.1
Capitoline Hill: He is credited with the restoration and embellishment of the senatorial palace located there.1

While Nicholas V is remembered for these architectural contributions, it is noted that he often pillaged ancient monuments to quarry materials for his new construction projects.1