A grotto is an artificial cave that adds a unique charm to a pool. Pool grottoes can be small or large and are a great addition to a rock pool. A grotto is usually raised by waterfalls that make it look more like a natural cave. The cost depends on what is included in the design.
For example, most basic grottoes range in price from $5,000 to $10,000, while grottoes that include additional features such as slides and stairs can cost from $15,000 to $50,000.