Add spaces: Theoldandwell-preservedcastle,whichstandshighabovePlatanos,AgiaMarinaandPanteliisobvious.

Answer: The old and well-preserved castle, which stands high above Platanos, Agia Marina and Panteli is obvious.

Add spaces: ...theCourantsection,thethirdchapter-whenIgotholdofthatchapter,Istartedreadingonemorning,Ireadmorningandnightwithoutstopping.

Answer: ... the Courant section, the third chapter - when I got hold of that chapter, I started reading one morning, I read morning and night without stopping.

Add spaces: Goldchalicewithenamelledpainting.

Answer:
Gold chalice with enamelled painting.