Follows Franklin and Irene York, a couple who years ago discovered a chamber buried in their backyard which inexplicably leads to a strange, deserted planet.

In the summer of 1683, 300,000 warriors of the Ottoman Empire began the siege of Vienna. The fall of the city would have opened the way to conquer Europe. On September 11. was the main battle between the Polish cavalry and the Turks.

In an alternative version of 1969, the Soviet Union beats the United States to the Moon, and the space race continues on for decades with still grander challenges and goals.