What's the Big Deal With the Undying Lands?

[Lord of Angmar]

Etharius, your Numenorean curiosity would probably best be quenched with a reading of The Silmarillion. It's a mighty good read.

Strange. This Valinor is reachable by sea and is an actual piece of land on the planet?

Not exactly. Though it is reachable (only to those permitted by the Valar) via the Great Sea, it is not actually a piece of land within the physical confines of the planet Ea. In that sense it does somewhat resemble a Judeo-Christian Heaven. A jolly good place to retire.