First five things from the books. Definitely the Old Forest. Phantom evil spirit trees is always scary. The Barrow Downs of course. Who wouldn't be scared of long dead kings possessed by the Witch-King's evil spirits. The Ringwraiths obviously. Even their name, Nazgul, sounds terrifying. Shelob definitely presents a menacing presence. The Watchers of Cirith Ungol. They feed on terror. Now from the movies. The Nazgul were terrifying. Especially at Weathertop. The Crebain were somewhat scary. An ill-boding feeling was given. The Balrog might be seen as frightening, but not that much really. Grond the battering ram struck fear into the hearts of viewers. And of course Shelob had her dark and menacing presence once again. Honourable Mention: Sauron the Dark Lord in the prologue. He was so powerful and evil.
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The 'Lord of the Rings' is clearly fantasy for most of the usual reasons. Magic is always a big tip off that something is fantasy, as it does not really exist. Dragons and other fantasy creatures are also indications of the fantasy genre.
It is not specified in either The Lord of the Rings or The Silmarillion how long it took to forge the 20 Rings of Power.
NO. Unless she was under a lot of Orc make-up.
William "Bill" Nighy did not cameo in Peter Jackson's The Return of the King (2003), but he did voice Samwise Gamgee in the BBC Radio dramatization of The Lord of the Rings.
No, it is not based on any scientific facts. It is fantasy, not epic fantasy, but a more modern type of fantasy in which supernatural and magical elements take place in our own world. Science fiction uses scientific facts and technological elements and abides by our rules. Fantasy writers can make up their own rules.
Ok I am guessing you are thinking of King Theoden of Rohan, when Saruman is like posessing him. Hope that helps