Probably built around 50 AD, the Aqueduct of Segovia is one of the best-preserved monuments left by the Romans in Spain. The ancient aqueduct carries water 16 km (10 miles) from the Frío River to Segovia and was built of some 24,000 massive granite blocks without the use of mortar. The aboveground portion is 728 meters [...] long and consists of 165 arches more than 9 meters ]...] high. It [...] still provided water to the city in the 20th century."…
Reconstruction of the Mausoleum of Hadrian (Castel Sant'Angelo) in Rome.
The Park of Aqueducts is what brings fresh water to Rome. The Aqueducts, built in 312 B.C. allowed water to travel long distances up and downhill. A lot of Rome’s Aqueducts are underground but as you near the city of Rome, more Aqueducts are above ground.