In 1967 we all whined about the long waits that were the norm when we crossed back into the US from Mexico at the San Ysidro gate between Tijuana and San Diego. We had no idea what was coming. Many people are still surprised to learn that this is the world's busiest on-land border crossing, with more than 30 million people passing through it every year. Here is a recent view of the expanded Port of Entry during its latest construction phase.