Family visited 90 triangulation pillars in special challenge
Have you ever wondered what the concrete structures at the top of mountains and hills are? That's a question Press Packers Abigail and Joseph also wanted the answer to.They did some research and found out that they are called triangulation pillars or trig pillars. A triangulation pillar marks the highest part of the land, and were vital in map making when they were installed back in 1936.
Have you ever wondered what the concrete structures at the top of mountains and hills are?
That's a questi...
Have you ever wondered what the concrete structures at the top of mountains and hills are?
That's a questi...