All assets for the Observatory were built in Maya. Textures were done in Photoshop using the Physical Based Rendering method to produce Albedo, Normal, AO, Microsurface & Metalness maps. Animations and the fly through were done in UE4, using a combination of Matinees and 'local rotation' instructions.
Most kind permission to use the images of the airships "Old Harbour" "Gloomy Morning" and "Heavenly Guardian" was given by the talented VADIM VOITEKHOVITCH, whose other works can be found here: http://voitv.deviantart.com/
The portraits and other pictures in the frames are existing works of art that are old enough not to be linked to copyright law, and are credited as follows:
ALBERT BRIESTADT - Among the Sierra Nevada, Colarado; Estes Park, Colarado, Whyte's Lake; Rocky Mountain Landscape; Looking Down the Yosemite Valley
FREDRICK EDWIN CHURCH - Cotopaxi; Syria by the Sea; The River of Light
EUGENE DELECROIX - self portrait
PHILIP DE LASZLO - Portrait of Ivy Lennox Gordon