Maintenance workers are silhouetted by bright morning sunshine reflecting off the windows on a wall of the Shard building in London on April 30, 2013. (Andrew Winning/Reuters) #

A young boy jumps through a hole as others peer through the wall of a cell at Muzenze prison on November 21, 2012 in Goma, Congo. Almost all inmates of Goma's main prison managed to break out after prison warders abandoned their positions to flee from advancing M23 rebels. (Tony Karumba/AFP/Getty Images) #

A worker toils outside a broken cement wall in the collapsed garment factory building in search for bodies on May 2, 2013 in Savar, Bangladesh. (Wong Maye-E/Associated Press) #

"Por Una Cabeza" by artist Pelado covers a wall in the Palermo neighborhood of Buenos Aires on March 5, 2013. Buenos Aires has become one of the world's top capitals for international street art. (Natacha Pisarenko/Associated Press) #

People cast shadows on a wall covered in graffiti in Rio de Janeiro, May 11, 2013. Street art and graffiti are legal if done with the consent of building owners. (Pilar Olivares/Reuters) #

A woman walks along the East Side Gallery, part of the remains of the former Wall in Berlin on March 17, 2013. (Odd Andersen/AFP/Getty Images) #

Pedestrians walk past a wall of soccer balls displayed at a soccer equipment shop in Tokyo on February 21, 2013. (Kimimasa Mayama/EPA) #

Chinese artist Liu Bolin stands painted in front of a wall of magazines in the Kunstverein (art association) in Ludwigsburg, Germany on May 15, 2013. In his art works he blends himself with the background. (Bernd Weissbrod/EPA) #

A man checks an apartment with the walls blown off at the site of a blast in Reyhanli, Syria on May 13, 2013. (Umit Bektas/Reuters) #

An employee works in front of a wall of monitors in the central control room of the No.5 reactor at Chubu Electric Power Co.'s Hamaoka Nuclear Power Station in Omaezaki, Japan on May 17, 2013. (Toru Hanai/Reuters) #

A US Forestry fire fighter confronts a wall of flames during an out of control wildfire on May 2, 2013 in Camarillo, Calif. (Kevork Djansezian/Getty Images) #

A demonstrator lights up a spray can before a wall of riot police in Mexico City on December 1, 2012 during a post-election protest. (Eduardo Verdugo/Associated Press) #

Protesters move blocks of cement as they dismantle a wall in front of the presidential palace during a demonstration against President Mohammed Morsi in Cairo on December 11, 2012. (Hassan Ammar/Associated Press) #

Guests admire the west wall of the The Old Royal Naval College's Painted Hall following its first restoration in 50 years on May 2, 2013 in Greenwich, England. (Oli Scarff/Getty Images) #

People hang out on the beach next to the border fence separating Mexico from the US as the day comes to an end in Tijuana, Mexico on September 22, 2012. (Dario Lopez-Mills/Associated Press) #

A dog walks past the steel bars of the Berlin Wall memorial on November 21, 2012 at Bernauer Strasse in Berlin. (Britta Pedersen/AFP/Getty Images) #

Shin-Soo Choo of the Cincinnati Reds hits the outfield wall trying to make a catch at Wrigley Field on May 5, 2013 in Chicago. (Jonathan Daniel/Getty Images) #

Competitors at the Gladiator Rock N' Run maneuver the "beast," a wall they must scale to make it to the finish of the race in Irvine, Calif. (Mindy Schauer/The Orange County Register/Associated Press) #

A section of a half-mile long concrete wall, six feet tall and a foot or so thick, now covered with murals, built in the 1940s divides yards in Detroit on March 28, 2013. The wall was built with a simple aim: separate homes planned for middle-class whites from blacks who had already built small houses or owned land with plans to build in the neighborhood. It couldn't separate people on its own, people and policies would see to that, but it was enough to satisfy the Federal Housing Administration to approve and back loans. (Paul Sancya/Associated Press) #

The back of a Volkswagen Golf sticks out of the wall of a family home in Meissenheim, Germany on June 2, 2013. A drunk novice driver lost control of the vehicle. (NOTE: this photograph has been digitally altered to obscure the licence plate. The European Pressphoto Agency reports that the German press agency dpa provided the image, and must obscure the licence plate per German law.) (Wolfgang Kuenstle/EPA) #

An Afghan man takes a shortcut by climbing a wall at a hilltop in Kabul on May 11, 2012. (Danish Siddiqui/Reuters) #

Members of the 18th Street gang attend a mass at the prison of Izalco in El Salvador on April 13, 2012. (Ulises Rodriguez/Reuters) #

A child plays on a sticky wall on International Children's Day at Children's Palace in the Dongcheng district in Beijing on June 1, 2013. (Andy Wong/Associated Press) #

Cosmo Sarson's mural of Jesus breakdancing on the wall beside The Canteen is reflected in a window on June 11, 2012 in Bristol, England. The artist was commissioned by The Canteen to paint the wall, which is directly opposite Banksy's Mild Mild West. The controversial 'Breakdancing Jesus' was inspired by an actual event in the Vatican where breakdancers performed to an applauding Pope John Paul II in 2004, is likely to be the latest attraction for graffiti tourists visiting Bristol, often seen as the spiritual home of underground artist Banksy. (Matt Cardy/Getty Images) #

A child runs over a wall of sandbags near the flooding river Elbe in Dresden, Germany on June 6, 2013. (Jens Meyer/Associated Press) #

Girls play on a trampoline near a home blasted from a rock wall at the Rockland Ranch community outside Moab, Utah on November 2, 2012. (Jim Urquhart/Reuters) #

A competitor reacts after he performs at the Climbing Wall competition during the 2013 X-Games at Jiangwan Stadium in Shanghai on June 10, 2013. (Carlos Barria/Reuters) #

Soldiers rappel down a wall during a military graduation parade for trainees from the Libyan Army "Thunderbolt" Special Forces unit in Benghazi on May 16, 2013. (Esam Al-Fetori/Reuters) #

Liron Sitrek rappels down the wall of a hotel in La Paz on February 27, 2013. (Aizar Raldes/AFP/Getty Images) #

A woman looks from behind a brick wall of her house in the old quarters of Delhi on May 15, 2013. (Mansi Thapliyal/Reuters) #

Ivy crawls over a portrait of the Virgin Mary on a wall of a house in Madrid on March 22, 2013. (Juan Medina/Reuters) #

The Oppidans team huddle during the Eton Wall Game at Eton college in Eton on November 17, 2012. Originating in 1766, the game is played on a narrow strip 110 meters long up against a wall. The idea is to move the ball along the wall with your feet and score a goal at the far end. Goals are very rare, the last one scored was a hundred years ago in 1909. (Eddie Keogh/Reuters) #

Stone walls partition a hillside on the Dingle Peninsula in County Kerry, Ireland on May 29, 2012. (Jake Coyle/Associated Press) #

Tourists climb the Great Wall after a snow in Luanping, China on December 14, 2012. (Alexander F. Yuan/Associated Press) #

Waves crash against the sea wall at Seaham Harbour as successive bands of heavy rain moved across the British Isles on December 20, 2012. (Owen Humphreys/PA/Associated Press) #

Kyle Larson slides along the wall as Eric McClure goes low after the cars were involved in a multi-car crash on the final lap of a NASCAR auto race at Daytona International Speedway on February 23, 2013, in Daytona Beach, Fla. (John Raoux/Associated Press)#

A man is reflected in the electronic board on the wall of a securities firm in Tokyo on May 16, 2013. (Koji Sasahara/Associated Press)#

Graffiti artist Chimere paints a mural next to a highway in Dakar on May 9, 2013. (Joe Penney/Reuters)#

Sona Nakarmi, 7, writes on a wall at the Saraswati Temple during the Shreepanchami festival in Kathmandu on February 15, 2013. Children are given their first writing and reading lessons at the temple during this festival in the belief that the goddess of education, Saraswati, will help them excel in education. (Navesh Chitrakar/Reuters)#

An Indian devotee rests his forehead in respect on the wall of the Banke Bihari temple during Holi celebrations in Vrindavan, India on March 27, 2013. (Altaf Qadri/Associated Press)#