Short answers, pulled from the story.
Principal photography began on the 25th of April 2011, at Albuquerque Studios in Albuquerque, New Mexico. Production moved to Cleveland, Ohio, in August 2011 and concluded in New York City over two days.
Over 2,200 visual effects shots were completed by 14 companies including Industrial Light & Magic, Weta Digital, and Scanline VFX. Industrial Light & Magic served as the lead vendor creating key effects such as the Helicarrier and the New York cityscape.
The film grossed $623.4 million domestically and $895.5 million internationally totaling $1.519 billion worldwide. It became the third-highest-grossing film of all time at its release and the highest-grossing superhero film.
The second-weekend gross hit $103.1 million establishing a new record after the opening weekend total reached $207,438,708 on Friday the 4th of May 2012. The film opened across 4,349 theaters earning $80.8 million including an $18.7 million midnight run.
The film opened Friday the 4th of May 2012 across 4,349 theaters in the United States. Internationally it opened on the 25th of April 2012 in ten countries earning $17.1 million.