Space Shuttle Discovery has its final flight, runners compete in the Boston Marathon, and celebrations mark the 100-day countdown to the start of the 2012 London Olympics.
Space Shuttle Discovery, mounted atop a 747 shuttle carrier aircraft, flies over the US Capitol on its final trip to retirement. The longest-serving orbiter in the space shuttle fleet was flown from Kennedy Space Center in Florida to the Washington, DC, area to be transferred to the Smithsonian National Air and Space Museum. It will be placed on display in the museum's Steven F. Udvar-Hazy Center.
A garden of more than 20,000 flowers planted to resemble the Olympic rings is unveiled at Kew Gardens in London.
Men’s and women’s division winners Wesley Korir and Sharon Cherop, both of Kenya, celebrate their victories in the 116th Boston Marathon.
Tribal Khasi maidens and young men dressed in traditional costume dance during the Shad Suk Mynsiem Festival in Meghalaya, India. The “dance of the joyful soul” is one of the most important festivals of the Khasis, the indigenous tribe of Meghalaya's Khasi Hills.
Singer Santi White performs onstage during the 2012 Coachella Valley Music & Arts Festival at the Empire Polo Field in Coachella, CA.
On April 18, the London 2012 Olympic countdown clock in Trafalgar Square marked 100 days to go until the opening ceremony.
A member of the Cryophil Winter Swimmers Club lies on floating ice on the Yenisei River in Siberia.
Creations on display at the Temporary Museum for New Design during Milan Design Week in Italy.
A pack of riders climb the "Wall of Huy" during the Fleche Wallonne Classic cycling race in Huy, Belgium.
April 18 marked the start of the 11th annual Tribeca Film Festival in New York City.
Chinese athletes in Beijing practice tae kwon do during the rehearsal of a ceremony to mark the 100-day countdown to the London 2012 Olympic Games.
Competitors participate in the 36th Paris Marathon on April 15.
Men participate in the London International Invitational Wheelchair Rugby Tournament.
Russian billionaire Andrey Igorevich Melnichenko’s mega-yacht "A" is spotted anchored at a pier with the Singapore skyline in the background.