It starts with a crack in the rock, which widens into a cave over time. Eventually, the sea wears right through the cliff face creating an arch. The arch gets too wide to support the land above it ...

Most people think of visiting big cities, national parks, and beaches when they plan a U.S. trip. There’s hardly anyone who’s wondering what’s underground. The caves in the U.S.

This park got its name from a large metal dinosaur structure that used to lead into the sea caves below ... Pismo Beach and paddle among the arches. Unfortunately, there is no beach access ...

To the west of the beach is a scenic rock arch, which you can swim and snorkel ... about 10 minutes to reach Vourvoulitis, a remote sea-lake cave. However, walking down to swim in the cave is ...