Not quite a gateway to hell, but northern Canada has a gateway to the Hadean Eon, named after the Greek God of Hell.

Previously, poly(ε-caprolactone) (PCL) classical ring-banded spherulites with periodic twisted lamellae and nonclassical concentric ringed structures induced by rhythmic growth were obtained by ...

Birefringent ring-banded spherulites with radial periodic variation of thicknesses were grown from poly(ε-caprolactone) (PCL) solutions under conditions for which the solution concentration was held ...