The Caves of Benagil
Benagil Cave, also referred to as Algar de Benagil, is probably the most famous of all the sea caves in Algarve, Portugal. You'll see many beautiful villages and stunning sea caves.
The dome is impressive with its colorful rings and a blue opening at the top.
To get to Benagil Cave, you'll need to either kayak, take a small boat tour or swim, but beware, the ocean is rough, and even the best swimmers should take caution.