After installing Therion you may try it on example data:
Download the
sample data from Therion web page and unpack it somewhere on your computer's hard drive.
Run XTherion (under Unix and MacOS X by typing 'xtherion' in the command line, under Windows there is a shortcut in the Start menu).
Open the file 'thconfig' from the sample data directory in the 'Compiler' window of XTherion
Press 'F9' or 'compile' in the menu to run Therion on the data—you'll get some messages from Therion, MetaPost and TeX.
PDF maps and 3D model are created in the data directory.
Additionally, you may open survey data files (*.th) in the 'Text editor' window and map data files (*.th2) in the 'Map editor' window of XTherion. The format of data files is explained in The Therion Book in detail.
Other sample files are available here