Papuan tribesmen ride a ceremonial boat during the Lake Sentani festival located in Indonesia's eastern Papua province on June 20. For decades, the only foreign visitors to venture into Papua were gold-diggers, anthropologists, missionaries and soldiers fighting imperial wars. But the vast, western half of New Guinea is slowly opening its doors to tourists as a "hidden paradise", a land of ancient tribal cultures, glittering reefs, soaring glaciers and teeming wildlife. The annual festival brings together thousands of people from 24 communities scattered around the huge lake.

A tribesman uses a shell as a horn during the Lake Sentani festival.

Papuan tribal houses are built on stilts on the edge of Lake Sentani, the site of annual festival.

A girl sits inside her flooded home in El Casadero Niltepec in the state of Oaxaca, Mexico on Thursday, June 30. Torrential rains hit large parts of central Mexico as Arlene, the first tropical storm of the Atlantic hurricane season, moved inland after drenching southern coasts, felling trees and flooding streets on Thursday.

Catherine, Duchess of Cambridge arrives at Macdonald-Cartier International Airport on June 30, in Ottawa, Canada. The newly married Royal Couple have arrived in Canada today for their first joint overseas tour. Ottawa is the start of a 12-day visit to North America which will take in some of the more remote areas of the country such as Prince Edward Island, Yellowknife and Calgary. The Royal couple will also join millions of Canadians to take part in tomorrow's Canada Day celebrations which mark Canada's 144th Birthday.

The Duchess of Cambridge, Kate, greets the crowds as she and Prince William take part in a ceremony at the National War Memorial in Ottawa, Canada on Thursday, June 30.

Britain's Prince William (L) and his wife Catherine, Duchess of Cambridge lay a wreath and flowers at the National War Memorial in Ottawa June 30. The couple will tour seven cities in four provinces and one territory in Canada before heading to California on July 8.

Members of the police make an arrest following scuffles during a public sector worker march through central London, on Thursday, June 30, in London. Hundreds of thousands of public sector workers, including teachers and civil servants, across the UK are to stage a mass strike today in protest at the governments planned cuts to pensions.

Demonstrators march past the Houses of Parliament during a protest over pension reforms in London on Thursday. Teachers and civil servants marched through the streets and picketed government buildings across Britain Thursday in protest at planned pension reforms, launching what could be a long period of labour unrest over austerity measures.

Public sector workers take part in a marchl on June 30, 2011 in Bristol, England. Hundreds of thousands of public sector workers, including teachers and civil servants, across the UK are staging a mass strike today in protest at the governments planned cuts to pensions.

Members of the Solidarity trade union shout slogans during the biggest demonstration in three years against the government's economic policy in Warsaw on June 30, 2011. Several thousand union activists rallied in the Polish capital accusing the government of sidelining social and economic problems, as Poland braces to take the helm of the EU. Solidarity is best known internationally for having helped bring down Poland's communist regime in 1989.

A view over the courts on the tenth day of Wimbledon at the All England Lawn Tennis and Croquet Club on June 30 in London, England.

British player Andy Murray looks towards the media during a practice session at the Wimbledon Tennis Championships in London on June 30.

A Department of Environment and Conservation (DEC) officer slits open a teddy bear. A Hong Kong couple have been arrested in Perth, Australia, for attempting to export reptiles concealed inside teddy bears.

One of the bobtail lizards discovered after the arrest of two wildlife smugglers.

A DEC officer examines one of the reptiles.

Prince Albert II of Monaco and bride-to-be Charlene Wittstock attend to the St Jean Religious Parade , Thursday, June 23, 2011, in Monaco. Prince Albert II of Monaco and his fiancee Charlene Wittstock of South Africa, will wed on July 1 and 2.

Prince Rainier III of Monaco and U.S. actress and princess of Monaco Grace Kelly salute the crowd as they leave Saint Nicholas Cathedral after their wedding ceremony in Monaco on April 19, 1956 in a convertible cream and black Rolls Royce offered by the people of Monaco as a wedding gift. In Monaco, commentators are convinced that the marriage of Prince Albert will be an even bigger event than his parents' 1956 wedding, which saw prince Rainier tie the knot with U.S. film star Grace Kelly.

A photo taken on April 19, 1956 shows U.S. actress Grace Kelly and Prince Rainier of Monaco during their wedding ceremony in Monaco.

A wave of smoke billows and fills a canyon as the Las Conchas fire creeps into the canyon on June 29.

The Las Conchas fire burns along the top of a mesa on June 29.

Aerial view of the Jiaozhou Bay bridge on June 29. Linking China's eastern port city of Qingdao to an offshore island, Huangdao, it is the world's longest cross-sea bridge at over 26 miles.

Part of the Jiaozhou Bay bridge.

Construction work on the Jiaozhou Bay bridge on June 1. The bridge opened on June 30 after more than four years of building work.

The Jiaozhou Bay bridge during construction on January 6. The bridge is expected to carry over 30,000 cars a day and will cut the commute between the city of Qingdao and the sprawling suburb of Huangdao by between 20 and 30 minutes.