Photo credits

Photos from Wikimedia Commons, used under the licences shown. Thanks to their authors.

The tuff sculpture of Aeolus at the entrance of Napoli Sotterranea in Piazza San Gaetano
Bruno Gentile · CC BY-SA 4.0 · colours and contrast edited
The Basilica of San Paolo Maggiore and the monument to San Gaetano in Piazza San Gaetano, next to the Napoli Sotterranea entrance
Gary Todd · Public Domain Mark 1.0 · colours and contrast edited
Via dei Tribunali in the historic centre of Naples, with festive ribbons hung between the buildings
Diego Delso · CC BY-SA 4.0 · colours and contrast edited
Reconstruction of a tuff quarry with cut blocks and tools in the Naples underground
Armando Mancini · CC BY-SA 2.0 · colours and contrast edited
A Renaissance cistern with softly lit green water in the Galleria Borbonica, Naples
Associazione Culturale Borbonica Sotterranea · CC BY-SA 4.0 · colours and contrast edited
A 1940s motorcycle on display behind a spoked wheel in the Galleria Borbonica, Naples
Associazione Culturale Borbonica Sotterranea · CC BY-SA 4.0 · colours and contrast edited
The tuff staircase of the main entrance of the Galleria Borbonica, Naples
Associazione Culturale Borbonica Sotterranea · CC BY-SA 4.0 · colours and contrast edited
Plants growing under lamps in a tuff cavern of the Naples underground
Dominik Matus · CC BY-SA 4.0 · colours and contrast edited
A wartime display with a tank and soldier silhouettes in a tuff cavern of the Naples underground
Dominik Matus · CC BY-SA 4.0 · colours and contrast edited
The brick-vaulted passage by the stage of the Roman theatre of Neapolis, in the Naples underground
Armando Mancini · CC BY-SA 2.0 · colours and contrast edited
A lit gallery with burial niches in the Catacombs of San Gennaro, Naples
Dominik Matus · CC BY-SA 4.0 · colours and contrast edited
An early Christian fresco of two standing saints in an arch of the Catacombs of San Gennaro, Naples
Dominik Matus · CC BY-SA 4.0 · colours and contrast edited
The crypt basilica of the Catacombs of San Gaudioso beneath Santa Maria della Sanità, Naples
Peppe Guida · CC BY-SA 4.0 · colours and contrast edited
The ancient Roman market street in the archaeological excavations under San Lorenzo Maggiore, Naples
MentNFG · CC BY-SA 4.0 · colours and contrast edited
The Gulf of Naples and Vesuvius seen from Castel Sant'Elmo, with the Certosa di San Martino in the foreground
Wolfgang Moroder · CC BY-SA 3.0 · colours and contrast edited
The Gothic-style façade of Naples Cathedral against a blue sky
Avemundi · CC BY-SA 3.0 · colours and contrast edited
The Obelisk of San Domenico and the apse of San Domenico Maggiore in the historic centre of Naples
Mongolo1984 · CC BY-SA 4.0 · colours and contrast edited