Aqueducts were built to bring a constant flow of water from distant sources into cities and towns, supplying public baths, fountains and private households. Many aqueducts over land connect points of similar height in a landscape, usually by bridging a river valley or other eroded opening in an otherwise flat area. This list describes the old aqueducts that were built in the period since the 1st century (Roman times) till the 19th century. 1. Aqueduct of Segovia, Spain. 
2. Aqueduct of Santiago de Querétaro, Mexico. 
3. Pont du Gard, France. 
4. Eagle Aqueduct, Spain. 
5. Aqueduct of Vanvitelli, Italy. 
6. Pegões Aqueduct, Portugal.
7. Roquefavour Aqueduct, France.
8. Águas Livres Aqueduct, Portugal.
9. Kavala Aqueduct, Greece.
10. Valens Aqueduct, Turkey.
I did not know these were still standing. Very interesting.
Good point.:)