It belonged to a sophisticated, 6 km long aqueduct, running along the steep cliffs of the valley.

Although Amtrak has installed locked gates, the children get onto the bridge about 20 blocks east, via its long aqueduct.

A 6 km long aqueduct supplies the city with pure water; it was begun early in the 15th century and completed in 1622.

Additionally, the California Aqueduct runs through the area, providing water to crops and is one of the world's longest artificial aqueducts.

Nearly 1 km long, it is the longest aqueduct in the world.

A 20-km long aqueduct, built in the 15th century, is still working, supplying three hydroelectric power plants (one of them located 245 m below the ground).

Those studies served as the basis for designing the longest aqueduct in the world.

Water was collected along 12.5 mile (20 km) long aqueducts.

It was the longest aqueduct in the state.

It is the longest gravity-fed aqueduct in the country, with no pumps along its route.