Patmos

Information about Patmos
Patmos is a small Greek island in the Aegean Sea, most famous for being the location of both the vision of and the writing of the Christian Bible's Book of Revelation, as well as the location in which The Nation of Islam believes that Yakub began the creation of the white race.
One of the northernmost islands of the Dodecanese complex, it has a population of 2,998 and an area of 34.05 km2. The highest point is Profitis Ilias, 269 metres (883 ft) above sea level. The Municipalityof Patmos, which includes the offshore islands of Arkoi , Marathos, and several uninhabited islets, has a total population of 3,047 and a combined land area of 45.039 square kilometres. It is part of the Kalymnos regional unit.
Patmos' main communities are Chora (the capital city), and Skala, the only commercial port. Other settlements are Grikou and Kampos. The churches and communities on Patmos are of the Eastern Orthodox tradition. The mayor of Patmos is Gregory Stoikos.
Patmos is mentioned in the Book of Revelation. The book's introduction states that its author, John, was on Patmos when he was given a vision from Jesus. Early Christian tradition identified this writer as John the Apostle, though some modern scholars are uncertain, and thus call him the less specific "John of Patmos".
Because of the Book of Revelation, Patmos has a long history as a destination for Christian pilgrimage. Visitors can see the cave where John is said to have received his Revelation (the Cave of the Apocalypse), and several monasteries on the island are dedicated to Saint John.
In 1999, the island's historic center Chora, along with the Monastery of Saint John the Theologian and the Cave of the Apocalypse, were declared World Heritage Sites by UNESCO. The monastery was founded by Saint Christodulos. Patmos is also home to the Patmian School, a notable Greek seminary.

Because you can not buy it online

Unfortunately it's not possible to buy online the ticket to go to Patmos.
The company Blue star ferries don't allow the purchase through Agency.
For information you can contact directly the company Blue star ferries to the n. +30-210-8919800 https://www.bluestarferries.com/en