For the most part, all the various planes are exactly as the appear in The Manual of the Planes. Read below for a quick overview of each. Note also that 4e has neglected to use an ethereal plane and b/c it would be more trouble than I’m willing to commit to put one in there isn’t one.
The World Axis cosmos consists of a core of five planes that have their own discrete existence, plus scores of dominions or realms that are features or locales of another plane. The planes are:
The World: The mortal plane of existence is the natural world. This world may be Abeir-Toril, Athas, Eberron, Krynn, Oerth, or a world of your own devising. This plane also encompasses the space between worlds.
Parallel Planes: Inextricably linked to the natural world are two parallel planes: the The Feywild (or Plane of Faerie) and the Shadowfell (or Plane of Shadow). They are the closest of the planes to the mortal world.
Fundamental Planes: The mortal world and its parallel planes exist between two great infinite expanses—the Astral Sea and the Elemental Chaos. The Astral Sea is dotted with smaller planes called astral dominions, the Elemental Chaos with elemental realms.
Astral Dominions: All astral dominions are clearly delineated from the surrounding fundamental plane. These are planes in every sense of the term. Some are the domains of deities. Others were abandoned or had their inhabitants and structures destroyed long ago. Major astral dominions include:
✦ Arvandor, the Verdant Isles
✦ Celestia, the Radiant Throne
✦ Kalandurren, the Darkened Pillars
✦ The Nine Hells of Baator
✦ Pandemonium, the Howling Depths
✦ Tu’narath, City of the Githyanki
Elemental Realms: In the vastness of the Elemental Chaos lie scores of elemental realms. Some of these, such as the Abyss, are differentiated enough from the surrounding elemental maelstrom to be planes within a plane. Others are specific locales within the chaos. Major elemental realms include:
✦ The Abyss
✦ The City of Brass
Demiplanes: Demiplanes are places that exist outside the fundamental planes. Each was created by artifice at some point in the past, since they do not naturally occur. Many demiplanes exist, but only a few are known by more than a handful of individuals. The most famous demiplane is Sigil, City of Doors.
Anomalous Planes: Finally, the cosmology includes some planes whose exact nature is not clear. Major anomalous planes include:
Although the means may vary, the methods of planar travel fall into one of several broad types: portals, rituals, vessels, and phenomena.
For info on travelling by any means call or PM me