In 2016, I road-tripped along the US-Mexico border, starting in Tijuana and heading east. You can read more about that trip here.
The fencing that runs along much of the border begins in Tijuana, where it extends into the ocean.

The fence is powerful both physically and symbolically. The street art that adorns the pickets is somber and full of gravity, reflecting the harsh reality of one of the world’s deadliest land borders. Since 1998, more than 8,000 migrants have died while trying to enter the US via Mexico.
One section of the border fence bears the names of migrants who didn’t survive the journey.