The Meta Sudans (Latin: "sweating turning post") was a large monumental conical fountain in ancient Rome.

[2] A meta was a tall conical object in a Roman circus that stood at either end of the central spina, around which racing chariots would turn.

The fountain was obviously damaged in the Middle Ages because it already appears as a ruin in early views of the Colosseum.

Photos from the end of the 19th century show a conical structure of solid bricks next to the Arch of Constantine, surrounded by its own original, reflecting stone pool.

The ruins of Meta Sudans survived until 1936, when Benito Mussolini had its remains demolished and paved over to make room for the new traffic circle around the Colosseum.