When flowing lava's upper layer cools, lava tubes form. The ones at Kaumana Caves State Park on Big Island are easily accessible for an adventure.

Located in Hawaii Volcanoes National Park on Big Island, the arid and desolate Kau Desert has preserved human footprints, which reportedly belonged to warriors in the late 1700s.

At the former home of the wealthy Allerton family in Kauai, pore over their trove of personal photos, artwork, and sculptures, and stroll the garden planted by Hawaii’s Queen Emma.

Striking watercolors will make it seem like you've entered another world as you go into the main cave and swim through to Waikapalae Wet Cave, or the Blue Room, at Ke'e Beach on Kauai.

Makauwahi Cave on Kauai is the state's largest limestone cave and home to fossils of shells, leaf imprints, and the bones of a Talpanas Lippa, an extinct duck that couldn't fly.