Panama Canal Zone
When the Panama Canal was built, 100 years ago, it was a marvel. But now, many big cargo ships are too big to go through.
Panama is in the middle of adding a third set of locks big enough to handle the new ships.
The new locks will be 1,400 feet long by 180 feet wide. The original locks are 1,000 feet long by 110 feet wide. The cost of the new locks is estimated to be between $15 billion and $25 billion.