1. Boca do Inferno, which translates to \"Hell’s Mouth,\" is a natural wonder located in Cascais, Portugal. It is a unique rock formation where the Atlantic Ocean waves crash against the cliffs, creating a dramatic spectacle of water sprays and sounds. The rock formation was carved out by the sea over thousands of years, resulting in a small cave-like hole in the cliffs. Boca do Inferno is a popular spot for tourists and locals alike to visit and admire the power of nature.

2. The site of Boca do Inferno is open to the public 24 hours a day, 7 days a week, and there is no entrance fee required to visit. However, there are no specific facilities or opening hours for visitors. If you need to contact the local tourism office for more information, you can try calling +351 214 825 400.

3. To reach Boca do Inferno in Cascais, you can take a short drive or a pleasant walk from the town center. There are also public transportation options available, such as buses or taxis, to get you to the site. The area around Boca do Inferno is easily accessible and there is parking available nearby if you are driving. Be sure to wear sturdy shoes as you explore the rocky terrain near the cliffs.