After the Great Fire of 64 AD, Emperor Nero built himself a palace across 1/3 of Rome. 300 rooms. Ceilings covered in gold and jewels. A revolving dining room (discovered in 2009 — the mechanism still works). A 30m-tall bronze statue of himself as the sun god (Colossus Neronis — the Colosseum is named after it). An artificial lake where the Colosseum now stands. After Nero's suicide in 68 AD, his successors systematically buried the Domus Aurea under public buildings — Vespasian drained the lake and built the Colosseum, Trajan built his baths on top. The palace was forgotten for 1,400 years. Then, in the 1480s, a Roman fell through a hole in the Esquiline Hill and found himself in a painted cave. Renaissance artists (Raphael, Michelangelo, Ghirlandaio) lowered themselves through the ceiling on ropes and copied the frescoes by candlelight. They called the painted rooms "grotte" (caves) — and the decorative style "grotesque" (a word that literally means "from the grotto"). Rome museums →
The tour is underground — you're inside Nero's buried palace beneath Trajan's baths. Hard hats required (provided). The Octagonal Room: the engineering marvel — an octagonal domed room with an oculus (like a miniature Pantheon) that may have been the revolving dining room's location. The frescoes: fragments of the original decoration survive — gods, mythological scenes, the "grotesque" patterns (floral scrolls, fantastical creatures, architectural illusions) that Raphael copied and used in the Vatican Logge. Virtual Reality: the tour includes VR headsets that reconstruct the rooms in their original gold-and-fresco splendor — you stand in the ruined room and SEE it as Nero saw it. The most technologically impressive archaeological tour in Rome.
Via della Domus Aurea 1 (Colle Oppio park, above the Colosseum). €16 (includes VR + guided tour, 75 min). WEEKENDS AND HOLIDAYS ONLY (Sat-Sun + holidays, tours at 9:15am, 10:30am, 12pm, advance booking on coopculture.it). Book 2-4 weeks ahead. Temperature underground: 10°C year-round — bring a jacket even in summer. Metro B Colosseo (5 min walk). Combine: Domus Aurea (morning) → Colosseum (afternoon) → realize the Colosseum was built as a political statement AGAINST Nero, replacing his private lake with a public amphitheatre.