Classical Orders of Architecture: An illustrated description of the Doric, Ionic and Corinthian orders from the Charlotte-Mecklenburg Historic Landmarks Commission.
Kusadasi.biz: Ephesus Guide: A tour of the astonishing remains of a Greek and later Roman town in Turkey, including history and interactive panoramas.
Maecenas: Images of Ancient Greece and Rome: Photographs by Leo Curran, University of Buffalo, of Classical remains across Europe, with some models and reconstructions of their original appearance. Searchable.
Parthenon Frieze: A Flash site that clearly places the Panathenaic Procession on the frieze of the Parthenon.
The Corinthian Style: Expandable images of Corinthian capitals, columns and entablatures from 350 B.C. to 526 A.D, all captioned with location, supplied by John Monkus.
The Museum of Reconstructions: A non-profit digital museum creating electronic reconstructions of ruined masterpieces of ancient architecture.
Wikipedia Classical Architecture: An illustrated history and description of the architecture of ancient Greece and Rome.