The Dalki
On earth on one of the very few pieces of land that still existed, was a reasonably large tower that had been built. It was on a small island where the only thing on it was the tower itself. The tower was so large and grand in size, that if someone was to stand at the top of it, they could reach the clouds.
But its purpose wasn't for anything grand like tourism. Such a piece of equipment as grand as this could never have been able to be built before. But thanks to Richard Eno and his team, they managed to finally finish it after the war.
This sole tower's purpose was to monitor the activity of each of the planets on the other side of the portals. It needed a strange source to power it that only Eno knew off. It was the same source of power used to power the portals.