Dungeonosophy
Legend
How about this. Make a hardcover atlas which includes a map of all the D&D worlds ever published by TSR and WotC. That'd be one way to hit home that the all the D&D worlds are still ripe for adventure. Such a book would appeal to many different D&D groups.
Abeir-Toril:

Eberron:

Io's Blood Island Chain, the setting of Council of Wyrms:

Krynn:

Mystara (the classic Known World region is outlined in the little rectangle) and the Hollow World:


Nerath:

Pelinore:

Ravenloft:

The Realm of the D&D Animated Series:

Abeir-Toril:

Eberron:

Io's Blood Island Chain, the setting of Council of Wyrms:

Krynn:

Mystara (the classic Known World region is outlined in the little rectangle) and the Hollow World:


Nerath:

Pelinore:

Ravenloft:

The Realm of the D&D Animated Series:

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