Thanks to Mr. Robert Spencer's JihadWatch for bringing this evil intention of hell's soldiers to our attention:
“Imam Ahmad reported in his Musnad that Abdullah bin ‘Amr bin Al-‘As (may God be pleased with him) reports, Whilst we were around the Prophet (peace and blessings be upon him) writing down, he was asked, ‘Which of the two cities is to be opened first, Constantinople or Rome?’ He (the Prophet) answered, ‘The city of Heraclius will be opened first!’” (Imam Ahmad, and Al-Albany)
Sheikh Yousef Al-Qaradawi quoted this hadith a few years ago and added: “This means that Islam will return to Europe as a conqueror and victor, after being expelled from it twice – once from the South, from Andalusia, and a second time from the East, when it knocked several times on the door of Athens.”
And the Saudi Sheikh Muhammad bin Abd Al-Rahman Al-’Arifi, imam of the mosque of King Fahd Defense Academy, once boasted: “We will control the land of the Vatican; we will control Rome and introduce Islam in it. Yes, the Christians, who carve crosses on the breasts of the Muslims in Kosovo – and before then in Bosnia, and before then in many places in the world – will yet pay us the Jiziya [poll tax paid by non-Muslims under Muslim rule], in humiliation, or they will convert to Islam.”
There are many more such statements here.