As others have said, the key is Antarctica.  Why do world leaders secretly visit there?  What's to see?  Why are there multi military bases there?  What is being explored?  What is being kept secret?

A few things i've run across that *might* be true (I have no way to prove):
1.  The Book of Enoch (was considered part of Old Testament in Christ's day but post Jerusalem destruction in 70AD, it's texts were lost, so it was left out of canon).

  a.  Enoch describes a place geographically similar to Antarctica where the "fallen angels" of Noah's days were chained in the center of the earth.  These are not devils but the "evil spirits" who roam the earth, when God allows.
  b.  The point is, I believe that part of Christ's allowance for the devil's "100 years of power" in Pope Leo's vision was to allow these "fallen angels" to communicate with men directly, so to advise them on how to build satan's kingdom (if God so allows it).
  c.  Such communication happened in the day's of Noah, which led to the Nephalim, and also post-Flood, when the "Giants" roamed the earth and which led to the construction of the Tower of Babel (one of the first attempts at building satan's kingdom on earth).

2. Antarctica is very mysterious and off-limits.  Why?
  a.  Antarctica is supposedly very mineral-rich and might not be as cold as we are led to believe.  Some scientists say that there are tropical like conditions in the lower regions of the ice, with warm waters, which is one reason why the "polar ice caps" melt on a normal, routine basis.
  b.  There are military bases in Antarctica (that we know of) - what else was built there that we don't know about?  Imagine what could've been built there in the last 70 years, with a combination of money, effort and planning between every major nation on earth?  The possibilities are staggering. 
  c.  I think this is where the elites keep all the super-high-technology that they've been working on.  I think "Area 51" was invented (with the alien story) to make people focus on this area, while forgetting all the vast regions of Antarctica, and why the elite global leaders travel there multiple times a year (probably to communicate with devils).
  d.  Antarctica being off-limits also hides the flat earth, which if people found out, would make the entire scientific house-of-cards-community of the past 150 years (going back to evolution) to implode.  People would immediately realize that almost everything they've ever been taught is a lie and society would return to truths which were commonly accepted back in the 1700s, before technology replaced common sense.

Train track is flat according to ball earthers, yet they also think it bends to follow the curvature of the earth somehow.  Either it's level or it bends, ball earthers want it both ways. They can't have it both ways. My explanation is exactly as I meant it to be and if read as it is stated, without prejudice, makes perfect sense as an answer to someone.  Atmospheric pressure has no bearing here.  We're talking about level and curve which ball earth people somehow equalize.  If a train track is truly level, as in straight and flat and without bend, it cannot extend for hundreds of miles on a ball without exceeding the "gravitational level" pretense, nor would said track stay on the ground but wind up miles above ground because the track is straight but earth is curved.  But that never happens because earth is not curved. I said it every way possible before, this is just another way of stating facts.  Gravity cannot be measured, even according to authorities.  They have theories according to "planetary" objects, but even then, it isn't consistent because certain bodies defy "gravity" and there's no explanation for why.  In other words, "gravity" is a seriously flawed theory.  I'm not saying things don't fall at a certain rate, they do.  But that is totally different than the said gravity that attracts celestial objects together.  Even then, with all the lies coming out of the scientific community, we really don't know how that works, or if it even exists. 

Globe indoctrination has been around since the beginning of time. Pagan philosophies and sciences have always been at odds with early civilizations and later, the Church.  Most ancients believed earth to be like a terrarium, mountains, hills and valleys over a flat terrain with celestial sun moon and stars in the firmament, and the heliocentric model didn't quite take serious foothold until the 16th and 17th centuries. Still, in the 15th century Columbus suffered major persecution for suggesting earth was not a globe.  The powers that be are still after him, tearing down statues and defaming him. Of course, the elite prior to these times were always serving up their versions of globe earth, but the pressure began to ramp up when Galileo came up against Robert Bellarmine and the Pope. The biggest and most effective indoctrination started in the 20th century with mass production of the classroom globes and television when NASA supposedly sent a man to the moon and showed for the first time, pictures and video of a globe earth from space, seemingly proving their case.  A closer look reveals that all of their "photos" are cgi renderings and NASA admitted all of the "photos" are photoshopped.

Columbus believed the earth was round. His entire trip was to go around the world and go to India from behind. The Heliocentric model doesn't prove that the earth is round or flat. NASA's CGI doesn't prove either way either, it just means the photos are faked.

I’ve never heard this before, do you have a reference to support this?

Thus the possibility of antipodes in the southern hemisphere … became a stumbling block with some of the sages of Salamanca.

“The idea of the roundness of the earth,” he adds, “was the cause of inventing this fable of the antipodes with their heels in the air….”

They don't lay straight track. They lay straight track elements which precisely follow the shape of the ground they're laid on. Simplified, this is what a train track on a curved ball looks like, viewed from a profile:

It's not flat at all. You also don't need to account for this, the curvature is so subtle that you don't need to.

No, that "dome" is an ice dome, a hill in a glacier.