Cornell University's Digital Library of the Fantastic

This is a very interesting collection of images. From the "About" page:

Sponsored by Cornell University's Institute for Digital Collections (CIDC) this image-bank provides a visual resource for the study of the Fantastic or of the supernatural in fiction and in art. [...]

In order to take maximum advantage of the materials in the Cornell collections, it seemed best not to adhere to a strict definition of either the Fantastic or its predecessor, the Marvelous, as these have emerged in literary criticism and theory. It will be useful, nevertheless, to note some general markers which have informed the choices implicit in these pages. In the context of western literature of the nineteenth and twentieth centuries, The Fantastic involves dread, fear and anxiety in the face of phenomena that escape rational explanation, or that reveal the notion of reality to be no more than a construct. A fantastic experience can therefore be likened to the breaking or shattering of a frame. While the literary fantastic is limited to the last 200 years, the Fantastic in art can be construed more broadly. This elasticity allowed us to choose images from works spanning a period from medieval manuscripts and printed incunabulae, to the early twentieth century.

Images were selected for their intrinsic relationship to the topic, because they illuminated an important dynamic, or quite simply because they were unusually striking. Though, inevitably, some familiar pieces will be found in these pages, we have attempted to favor rare or unusual works that, to our knowledge, have not been reproduced before. Hence the concomitant emphasis on book illustration, and on a wealth of images that have remained more or less invisible in canonical art histories. Always, the goal has been to bring to light a body of material scholars were unlikely to have had the opportunity to study. [...]

Cornell's library holdings in several areas provide a deep well from which to draw for a project such as this one. The incomparable Witchcraft collection, the History of Science collection, a recent grouping of Russian Fables and Fairy Tales now on deposit in Kroch library and the serendipitous discoveries that seem so readily to occur once the search gets under way, have resulted in a data-base of nearly 300 images, distributed among several general rubriques or thematic clusters, with search and cross-referencing capabilities.

Widely varied and worth exploring, if you're into that sort of thing.