This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

This Birdsill Holly fire hydrant is the remnant of a very different type of hydration innovation.

A hurricane-stricken oak tree has been reborn as a beautiful chainsaw artwork.

A once-glowing grotto at the bottom of Waikapalae Wet Cave.

One of Oahu’s best snorkeling and diving spots was created by warm water discharged from the nearby power plant.

A glass display case holds the document that ended the Second World War—which one person signed on the wrong line.

In 2018, Pohoiki Road was severed by lava flowing from the eruption of Kilauea.

Inside, visitors are treated to the rich history of sugar farming and its impact on Hawaiian society.

Football field-sized microalgae production tanks on the Hawaiian coast create a stunning view from space.

The air force base preserves its scars from the Japanese attack on Pearl Harbor.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

This blowhole is supposedly caused by a trapped monster.

This unusual lava tube spouts seawater during high surf.

A prehistoric landscape hidden in the cliffs of Maha'ulepu.

A cooled lava flow from the Haleakalā volcano formed these surreal-looking columnar basalt structures.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

Submerged lava formations create incredible waterworks.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

Babe Ruth and others planted saplings for a 1930s tourism campaign. The saplings grew as the area faded.

This legendary urban waterfall creates a dazzling display of rainbows.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

This black shoreline is made up of exploded lava particles.