The mysterious "Henge" in Poland might have a more conventional explanation than some "antigravitational machine".

 The mysterious "Henge" in Poland might have a more conventional explanation than some "antigravitational machine". 

The change could have three parts. The container fills with mercury. The flying machine called "The Bell" ("Die Glocke")and the henge act as the protective building. The container filled with mercury will put to rotate, and that thing forms the parabolic mirror. Then the "Scauberger's vortex generator" will be put just in the middle of that parabolic mirror. Another mirror will focus sunlight on the parabolic mirror. 

The focused sunlight causes extremely fast rising air statues that put the vortex machine rotate very fast. That container acts as a generator that creates electricity which pushes the "Bell" upward. The idea was that electricity created in the generator will conduct to the "Bell". So the "Bell" was not an antigravitational machine. It used the electromagnetic vortex for creating thrust. The idea was to create an electromagnetic rocket engine that could use in ME-262 and other kinds of flying machines. 

But the tale about the "time machine". 

There is a possibility that the man behind this tale was  Frank Tipler when he analyzed the Henge he created the Tipler Cylinder. There is the possibility to create a system that uses virtual crossing the speed of light for creating the time reverse. The idea was that two ion fields are rotating in the magnetic henge. 

The circles of high-speed ions can make it possible where time dilates. Then researchers will put the third ion flown to rotate in the opposite direction of those ions in the outer layer. That thing causes the virtual crossing at the speed of light. Or there are multiple fast-rotating shells. And that thing makes it possible to make the time dilation or time reverse.

Time travel means jumping between energy levels. The border of the fourth dimension is the energy maximum in our universe. The fourth dimension starts when the energy difference between two objects increases so high that interaction between objects cuts. And if the object must travel backward in time its energy level must decrease below the energy minimum in the universe. 

The idea of time travel is a very simple thing. it's jumping between energy levels, as I just wrote. We must just create the energy level that puts particles to jump away from the universe to the upper energy level. And if we think that time travel is just jumping between energy levels we might think that this thing is quite easy to make. 

https://en.wikipedia.org/wiki/Tipler_cylinder