The Description of Greece (Greek: Ἑλλάδος Περιήγησις) by Pausanias is a guide to continental Greece written in about 160 CE. It focuses mainly on places and monuments of historical, religious and artistics interest, with observations on the natural world featuring only occasionally.
The work is divided into ten books covering: 1. Attica and Megara, 2. Corinth and Argolis, 3. Laconia, 4. Messenia. 5 and 6. Elis including Olympia, 7 Achaea, 8. Arcadia, 9, Boeotia, 10. Phocis including Delphi.
Free online texts
Internet Archive: Pausanias's Description of Greece, English translation with a commentary by James George Frazer. Multiple formats.
Loebulus. L093 - Pausanias - Description of Greece I: Books 1-2 (Attica and Corinth). PDF of public domain Loeb edition in Greek and English.
Loebulus. L188 - Pausanias - Description of Greece II: Books 3-5 (Laconia, Messenia, Elis 1). PDF of public domain Loeb edition in Greek and English.
Theoi.com: Description of Greece. English translation by by W.H.S. Jones and H.A. Ormerod. HTML format.
ToposText: English text hyperlinked to accompanying maps. HTML format.
Ancient History Encyclopedia: Pausanias (Geographer).
Digital Milliet Project: Excerpts on painting. Ancient Greek with English and French commentary. HTML format.
Livius: Pausanias the Periegete.
Peter Sommer Travels: Pausanias - The Father of Guidebooks, by Heinrich Hall.
PPG System: Pausanias Paths in Greece. English introduction to Greek language navigation system.
University of Texas at Austin Linguistics Research Center: Classical Greek Online - Lesson 10 - From Pausanias' Description of Greece. Winfred P. Lehmann and Jonathan Slocum.
Wikipedia: Pausanias (Geographer).
The Great Conversation: Further reading at Tom's Learning Notes
Herodotus: The Histories.
Strabo: The Geography.
Butler: Atlas of Ancient Geography.
Ancient Greek resources: Learn to read Greek classics in the original.