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In page United States Capitol:

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The Capitol draws heavily from other notable buildings, especially churches and landmarks in Europe, including the dome of St. Peter's Basilica in the Vatican and St. Paul's Cathedral in London.[11] On the roofs of the Senate and House Chambers are flagpoles that fly the U.S. flag when either is in session. On September 18, 1993, to commemorate the Capitol's bicentennial, the Masonic ritual cornerstone laying with George Washington was reenacted. U.S. senator Strom Thurmond was one of the Freemason politicians who took part in the ceremony.[citation needed]