There's a castle with a moat of boiling water - Apparently.
The Balmoral Castle, located in Scotland, has a unique feature: a moat that was once filled with boiling water. In the 19th century, the 2nd Earl of Fife installed a system that used hot water from the castle's central heating system to fill the moat. This was done for aesthetic purposes, as the boiling water created a dramatic visual effect, especially at night when lit by torches.