Caves

A hidden Buddhist gem accessible only by boat.

The site of an early Arthurian battle and the dwelling-place of prehistoric people and (possibly) an ancient race of giants.

Some of the secrets of human origin are revealed at this museum.

One of few vertical lava tubes in the world accessible by foot.

Once one of the most polluted caves in America, now an environmental success story and a museum dedicated to caves.

Over 40 species of fern cover the canyon walls of this lush green bowl, cut off from the bustle of the world by a cave entrance.

A cenote sitting in the middle of a parking lot shows the Yucatán Peninsula at its most urbanized.

The only natural cave bath in all of Europe.

A limestone grotto where daylight filters in from below and turns the water a beautiful turquoise. Also home to a small underwater nativity scene.

The warmest cave in the Ozarks features two seemingly bottomless lakes.

Cathedral-like Victorian vaults are hidden within this iconic bridge.

A wonderland of caves in eastern Iowa.