Opit's LinkFest!: 16 June

Krak des Chevaliers in Syria. It is an 11th century castle and was used in the Crusades. It was one of the first castles to use concentric fortification, ie: concentric rings of defence that could all operate at the same time. It has two curtain walls and sits on a promontory. (Photo credit: Wikipedia)

Roman theatre in Bosra, Syria. (Photo credit: Wikipedia)

English: View of Apamea, Syria Français : Vue de Apamée, en Syrie (Photo credit: Wikipedia)

The Omayad Mosque courtyard, with Şadirvans in pavilions, in Aleppo, Syria. (Photo credit: Wikipedia)

Sayyidah Zaynab Mosque in Damascus (Photo credit: Wikipedia)

English: View of the main (and oldest) building of Deir Mar Musa al-Habashi or Monastery of Saint Moses the Abyssinian, Syria Français : Vue du bâtiment principal (et le plus ancien) du monastère de Mar Mousa, Syrie (Photo credit: Wikipedia)

English: South facade of Church of Saint Simeon Stylites, Syria Français : Façade Sud de l'église de Saint-Siméon le Stylite. Syrie (Photo credit: Wikipedia)

SOUTH-UIST, UNITED KINGDOM - MAY 22: Marine experts perform an autopsy on a dead pilot whale from the pod of about 60 pilot whales that were spotted struggling in Loch Carnan, on May 22, 2011 in South Uist, Scotland. Marine agencies are continuing efforts to prevent about 60 pilot whales from stranding on the rocky shoreline of Loch Carnan on South Uist in the Western Isles. (Image credit: Getty Images via @daylife)