Guess What This Is

During the Montmarte walking tour, Pauline pointed out this unique concept.

Do you know what it is?

A few clues:

During the 1800's someone noticed the people of Paris drank more wine than any other liquid and decided this really wasn't in the city's best interest.

We pay big money for something that is available naturally in the city.

Horses needed to be kept away from these for sanitation.

Comments??? Anyone???