Where does a billionaire CEO and his new wife go on their honeymoon?

The answer may disappoint you. No, it's not a secret island, the International Space Station or the centre of the Earth... It's Italy.

Newly-minted Facebook CEO Mark Zuckerberg and his new wife (and college girlfriend) Priscilla Chan have been photographed enjoying a honeymoon in Italy, just days after his company floated on the Nasdaq stock exchange - to heavy criticism from some.

Zuckerberg and Chan visited Rome, where they were pictured touring the Sistine Chapel guided by a priest and private art critic.

They were also seen at the Spanish Steps and the Colosseum - though according to the Daily Mail, Zuckeberg was criticised for only spending 32 euro on lunch. The receipt proving the meagre meal enjoyed by the pair was later posted on Italian news sites.

According to Fox News, the couple also enjoyed a takeaway McDonald's.

More blurry shots from surreptitious photographers, tourists and gawkers were taken across the city.

Later Zuckerberg and Chan moved south, and were pictured in the coastal town of Amalfi. Take a look at the photos, below.

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  • Zuckerberg's Honeymoon

    Mark Zuckerberg and wife Priscilla Chan pictured in Italy as their honeymoon continues

  • Zuckerberg's Honeymoon

    Mark Zuckerberg and wife Priscilla Chan pictured in Italy as their honeymoon continues

  • Zuckerberg's Honeymoon

    Mark Zuckerberg and wife Priscilla Chan pictured in Italy as their honeymoon continues

  • Zuckerberg's Honeymoon

    Mark Zuckerberg and wife Priscilla Chan pictured in Italy as their honeymoon continues

  • Zuckerberg's Honeymoon

    Mark Zuckerberg and wife Priscilla Chan pictured in Italy as their honeymoon continues

  • Zuckerberg's Honeymoon

    Mark Zuckerberg and wife Priscilla Chan pictured in Italy as their honeymoon continues

  • Zuckerberg's Honeymoon

    Mark Zuckerberg and his new wife Priscilla Chan are on holiday in Italy

  • Zuckerberg's Honeymoon

    Mark Zuckerberg and his new wife Priscilla Chan are on holiday in Italy

  • Zuckerberg's Honeymoon

    Mark Zuckerberg and his new wife Priscilla Chan are on holiday in Italy

  • This photo provided by Facebook and released on Tuesday, May 22, 2012, shows Facebook founder and CEO Mark Zuckerberg and Priscilla Chan at their wedding ceremony in Palo Alto, Calif., Saturday, May 19, 2012. Zuckerberg updated his status to "married" on Saturday. The ceremony took place in Zuckerberg's backyard before fewer than 100 guests, who all thought they were there to celebrate Chan's graduation. (AP Photo/Facebook, Noah Kalina Photography)

  • Mark Zuckerberg, Priscilla Chan

    FILE - This May 19, 2012 photo originally provided by Facebook shows Facebook founder and CEO Mark Zuckerberg and Priscilla Chan at their wedding ceremony in Palo Alto, Calif., Saturday, May 19, 2012. Los Angeles-based designer Claire Pettibone says Priscilla Chan was wearing one of her dresses when she married Facebook CEO Mark Zuckerberg. Pettibone wrote on her blog that she didn't know Chan was wearing one of her most popular creations until she saw one of the photos released from Saturday's surprise ceremony. (AP Photo/Facebook, Allyson Magda Photography)

  • Mark Zuckerberg, Priscilla Chan

    In this July 9, 2011, file photo, Mark Zuckerberg, president and CEO of Facebook, walks to morning sessions with his girlfriend Priscilla Chan during the 2011 Allen and Co. Sun Valley Conference, in Sun Valley, Idaho. On Saturday, May, 19, 2012, Zuckerberg and Chan tied the knot at a small ceremony at his Palo Alto, Calif., home, capping a busy week for the couple (AP Photo/Julie Jacobson)

  • Zuckerberg In China

    Zuckerberg and Chan recently made this apparently random appearance in a documentary about the Chinese police.