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TIJUANA, MEXICO - OCTOBER 17: Pedestrians cross the international border from Mexico (L) to the United States (R) on the morning that the US population hit the historic milestone of 300 million on October 17, 2006 in Tijuana, Mexico. The 300 millionth American, clocked in at 7:46 am according to the US Census Bureau, could have been an immigrant crossing the border, a newborn, or someone entering the US by air. US population growth has been greatly fueled the influx and higher birth rate of Latinos and other immigrants in recent decades. This border crossing from Tijuana to San Ysidro, California is the world's busiest border crossing. (Photo by David McNew/Getty Images)

This is what it is like to walk across the U.S Boarder into Tijuana Mexico. Pretty neat if you’ve done it before, even cooler if you have never done it before. Sure are a lot of big metal security gates! Neat. Check it out. Border crossing starting in California and ending in Tijuana, Mexico.