One of the best example of modern architecture in Rome is, on my opinion, the Renzo Piano's "Auditorium Parco della Musica", a large multi-function public music complex.
Unfortunately, this wonderful construction is located out of the historic centre, in the north side of Rome, so tourists generally miss it.
Opened in 2002, Auditorium Parco della Musica combines architectural innovation with perfect acoustics. The complex is composed of three separate enormous bug-like halls whose forms are inspired by musical instruments. A fourth concert hall is the open air theater evoking Greco-Roman theaters.
The three large concert halls are structurally separated to assure soundproofing. Each one has a different dimension and purpose, but they are all characterized by an extreme versatility of the space: floor and ceiling can be moved to regulate the acoustic properties. Also the cherry-wood interiors guarantee an excellent sound.
The complex includes museums, a fantastic library, music studios, areas for exhibitions, cafes, restaurants, gardens and an archaeological site. Have a look to the events calendar: it hosts big international names in classical, rock, pop and world music.
Auditorium (http://www.auditorium.com ) is open daily from 10am to 6pm and the entrance is free! It is easy reachable by bus number 910 from Rome's train station (Stazione Termini). Ortherwise, if you're interested on any of the events, a shuttle bus M service departs from Stazione Termini every 15 minutes between 17:00 and the end of the last performance.
I encourage you to visit the Auditorium!! ....also for a good drink or meal at the charming "Red" cocktail lounge bar where you can absolutely spend a pleasant afternoon :)
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