Hello There!
In Chicago, this building was renamed to the "Willis Tower" They planned on reintroducing this building to the world.
They provide a good balance between the size and shape of land areas.
Answer:
They are fighting a civil war against the FARC. They are a Marxist-Leninist group, and are Far-Left. The FARC formed in 1964, and has waged a Guerilla war in the jungles for decades. There are peace negotiations ongoing, but many dissidents are still fighting.