Jay Honeck wrote:
1. Airports were originally huge grass fields that allowed arrivals and
departures in any direction, on any heading. Are there any airports left
that provide 360 degrees of access?

I believe Lakehurst, NJ still has the circular field where the
Hindenburg disaster happened. I used to see it out the right side of
scheduled airliners on the way from DCA to BOS just before going over NYC.

The question I have about this installation is what are the converging
sets of lines around it. IIRC there are 3 sets of 4 lines pointing
into the center of the circle.