triathlon from Marble Arch, London to the Arc de Triomphe, Paris. Run from Marble Arch in London to Dover , swim the English Channel to Calais, and then cycle from Calais to Paris. For this challenge, the clock starts at Marble Arch and stops at Arc de Triomphe. Only 46 people in history have completed this event. St. Anthony's, St. Petersburg, Florida. Held in the last week of April every year, this race attracts professional and amateur triathletes from around the world. One of the largest Olympic Distance triathlon in the U.S. with over 4,000 participants each year. Escape from Alcatraz, San Francisco, California. This non-standard-length race begins with a swim in frigid San Francisco Bay waters from Alcatraz Island to shore, followed by an bicycle and run in the extremely hilly terrain of the San Francisco Bay Area. The run includes the notorious "Sand Ladder", a 400-step staircase climb up a beachside cliff. Wildflower is a half-iron distance race held on the first weekend of May at Lake San Antonio on the Central Coast of California since 1983. Known for a particularly hilly course, it has expanded now to include three races of different lengths and is one of the largest triathlon events in the world, with over 8,000 athletes attending each year. Life Time Fitness Triathlon Series. Life Time Tri Series is a series of 5 Olympic distance races: The Lifetime Fitness in Minneapolis, the NYC Triathlon in New York City, the Chicago Triathlon, the LA Triathlon in Los Angeles, and the U.S. Open in Dallas. There is a combined $1.5 Million prize purse at stake for the professionals who come from around the world to take part in the series. Hy-Vee Triathlon, started in 2007 by the mid-west grocery store chain Hy-Vee. The race had the richest prize purse awarded for a single triathlon. The race was formally part of the World Triathlon Cup series from 2008 to 2010 and briefly served as the World Triathlon Corporation's 5150 Series U.S. Championships. Norseman Extreme Triathlon, Hardangerfjord, Norway. Norseman is an Ironman-distance triathlon that starts with a swim in the Hardangerfjord and finishes on top of a Gaustatoppen mountain at above sea level. Famous for its lower temperatures and total ascent, this race accepts only 200 competitors each year. Ironman 70.3 World Championship Grand Prix de Triathlon, the French club championship series sponsored by Lyonnaise des Eaux. The circuit