I have visited the forest moon of Endor, roamed the corridors of Hogwarts, lit a pipe in the Shire, and walked through the busy streets in King's Landing.
These fictional places often mean more to me emotionally than the physical places I have visited. Imagination has no limits, and in literature, movies, and games, imagination roams free in those realms. Fictional places also help us look upon our existence from new angles or just a healthy break from contemporary noise.
The omnipotent writer or director creates and populates his worlds. Questions of good and evil, human nature, politics, love, and self-realization are brought to life in contexts that obey their laws. Although the worlds are often described in detail, fictional journeys always leave room for your imagination to do its magic.
The latter is especially true for literature. Reading leaves much more room for individual interpretation than watching movies or playing games because the world is not delivered in full color and high definition; it is up to you as a reader to fill out the voids using your imagination. The result is that the same fictional world can look very different depending on who the recipient/reader is.
James Gurney's Dinotopia is a marvelous place to visit. Waterfall City is an incredible city where humans and dinosaurs live side by side. The culture is as rich as its libraries and museums.
The island has a varied landscape and a very diverse climate. You can experience anything from warm and tropical to wintry and snow-filled.
Gotham is the hometown of Bruce Wayne (a.k.a. Batman) in DC Comics' fictional world. It is often portrayed as a dark place with high crime rates, yet offers the traveler a lot of beauty and nostalgia.
Gotham's population consists of eccentrics, peculiar individuals with an exaggerated sense of fashion and ideas off the beaten track.