The Underground Water Palace is not far from the Blue Mosque. It's a very mysterious place. The Underground Palace is rather cold. I remember to add a coat. The light inside is dim. There are many super fat big fish in the water. There are water droplets that will drip down the pavement, so be careful to walk slowly. The upside-down Medusa is impressive. It really feels like being petrified. This is also the scene of the last section of the recent film Dante Code.