
While Acre (Akko) has been around for thousands of years (since 1500 BC), it's most famous as a Crusader fortress city, besieged by Richard the Lionheart and defended by the Knights Templar. In early 12th century, Acre was conquered by the Christian Crusaders; in 1187 Saladin, the great Islamic leader, captured the city, four years later, Richard the Lionheart re-took Acre. For the next 100 years, Acre was a wealthy Crusader port, until the great battle in 1291, when the Ottomans conquered Acre.
Templar Tunnel - In the late 12th century, the Knights Templar built the biggest Acre fortress along the ocean, with walls 28 ft thick (Saladin destroyed that castle). In 1994, it was discovered that the knights built an underground tunnel to go from the castle to the port area.
Hospitallers Fortress - Like the Knights Templar, the Knights Hospitallers (Order of the Knights of St. John) were warrior monks. The Hospitallers protected pilgrims and cared for the sick, and built great fortresses throughout the Holy Land.
Old city walls -There are plenty of places to see centuries of wall fortifications in Acre (the whole peninsula was encircled). Walk west on the promenade from the port, toward the lighthouse along the Ottoman city walls. Go north, and on the left in the shallow water are the foundations of the Templar fortress.