Domus Aurea
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The Domus Aurea was a vast landscaped complex built by the Emperor Nero largely on the Oppian Hill in the heart of ancient Rome after the great fire in 64 AD had destroyed a large part of the city.
Overlay of Trajan's baths on the Oppian Hill
Opus sectile from the Domus Aurea
Sala della Sfinge (Sphinx Hall), discovered in 2018
Fresco of sea-horses in the Sala della Sfinge
Grotto
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A grotto is a natural or artificial cave used by humans in both modern times and antiquity, and historically or prehistorically. Naturally occurring grottoes are often small caves near water that are usually flooded or often flooded at high tide. Sometimes, artificial grottoes are used as garden features. The Grotta Azzurra at Capri and the grotto at Tiberius' Villa Jovis in the Bay of Naples are examples of popular natural seashore grottoes.
Eternal Flame Falls in New York has an eternal flame inside a small grotto behind the falls
Grutas de García in Nuevo León, Mexico
Two vaulted grottoes called Taq-e Bostan, located in Iran, Sassanian era
Grotto in Cevio