This Week in Photos, Week of April 15-21, 2011

A member of a local rock climbing club jumps on floating ice during an ice drift on the Yenisei River in Russia's Siberian city of Krasnoyarsk.

Contestants compete in the Amateur Women's Classic Bodybuilding competition at the FIBO 2011 in Essen. The FIBO is the leading International sports trade show of wellness, fitness and health and takes place from April 14 to 17.

Members of the Gruppo Storico Romano (Roman Historical Group) dressed as centurions perform as they march past the ancient Colosseum in Rome, to mark the 2,764th anniversary of the founding of the city. According to legend, twins Romulus and Remus founded Rome on April 21 in 753 B.C.

Runners pass the halfway mark in the 115th Boston Marathon in Wellesley, MA.

People take pictures of a ship that was washed onto a building by the March 11 tsunami in Otsuchi, Iwate prefecture, over a month after the area was devastated by a 9.0 magnitude earthquake and tsunami.

The scenery for the opera 'Andre Chenier' by Italian musician Umberto Giordano is seen on a giant floating stage at Lake Constance in Bregenz. The opera, directed by British director Keith Warner, will have its premiere on July 20 at the annual Bregenz festival.

Competitors pass Big Ben in the Virgin London Marathon in London, England. 36,500 competitors will tackle the 26.2 mile course which passes several iconic London landmarks and finishes on the Mall in front of Buckingham Palace.

A gaucho is unseated by an untamed or unbroken horse during the celebration of "Criolla" (Creole) Week in Montevideo. Gauchos from all over the country come to Montevideo during Creole Week to compete for the award of best rider.

People fish with oil rigs in the background in Dauphin Island, AL. Dauphin Island's beaches were impacted by oil from the BP oil spill. April 20 marks the 1-year anniversary of the worst environmental disaster in US history.

Afghan children take part in a performance to celebrate the second World Circus Day in Kabul, Afghanistan. Some 35 countries across the world are expected to host events celebrating World Circus Day, which is organised by the International Circus Federation.

Coachella music fans watch the band Best Coast perform during the 3rd day of the Coachella Valley Music & Arts Festival 2011 held at the Empire Polo Club in Indio, CA.

Workmen put the finishing touches to a giant sculpture on the Hayward Gallery entitled 'Urban Fox' and made from straw bales in London, England. The sculpture features in the Southbank Centre's 60th anniversary celebration of the 1951 Festival of Britain.