Roof with infinity pool picture

Quick answer：

An infinity pool is a swimming pool that appears to extend to the horizon, creating the illusion that the water goes on forever. It is typically designed with one or more sides of the pool built at the property's boundary, allowing swimmers to look out over a landscape or body of water. Roof-top infinity pools are a luxury feature often found in high-end resorts or homes. They provide a unique vantage point for relaxation and are visually striking due to their unique design and location.