Guided tours of the Colosseum take place every Thursday and Saturday night from 2 May until 2 November.
The "Luna sul Colosseo" tour lasts 75 minutes and begins in the heart of the arena, incorporating the underground tunnels where gladiators and wild animals were held before combat, and also includes a visit to the first floor.
The tours are conducted in Italian and English and take place from 20.20 until midnight (last entry at 22.45).
Tickets cost €20, reduced €18, and tours begin at the northern gate opposite the Colle Oppio.
For bookings and info tel. 0639967700 (Mon-Fri 09.00-18.00, Sat 09.00-14.00) or see website.