A guide book or travel guide is "a book of information about a place designed for the use of visitors or tourists". It will usually include information about sights, accommodation, restaurants, transportation, and activities. Maps of varying detail and historical and cultural information are often included. Different kinds of guide books exist, focusing on different aspects of travel, from adventure travel to relaxation, or aimed at travelers with different incomes, or focusing on sexual orientation or types of diet.
Travel guides can also take the form of travel websites.
A forerunner of the guidebook was the periplus, an itinerary from landmark to landmark of the ports along a coast. A periplus such as the Periplus of the Erythraean Sea was a manuscript document that listed, in order, the ports and coastal landmarks, with approximate intervening distances, that the captain of a vessel could expect to find along a shore. This work was possibly written in the middle of the 1st century CE. It served the same purpose as the later Roman itinerarium of road stops.
The periegesis, or "progress around" was an established literary genre during the Hellenistic age. A lost work by Agaclytus describing Olympia (περὶ Ὀλυμπίας) is referred to by the Suda and Photius.Dionysius Periegetes (literally, Dionysius the Traveller) was the author of a description of the habitable world in Greek hexameter verse written in a terse and elegant style, intended for the klismos traveller rather than the actual tourist on the ground; he is believed to have worked in Alexandria and to have flourished around the time of Hadrian. An early "remarkably well-informed and interesting guidebook" was the Hellados Periegesis (Descriptions of Greece) of Pausanias of the 2nd century A.D. This most famous work is a guide to the interesting places, works of architecture, sculpture, and curious customs of Ancient Greece, and is still useful to Classicists today. With the advent of Christianity, the guide for the European religious pilgrim became a useful guidebook. An early account is that of the pilgrim Egeria, who visited the Holy Land in the 4th century CE and left a detailed itinerary.