The Hawai'i Tourism Authority has launched a marketing campaign that includes new roadside markers at 20 points of interest across the state it has designated as Heritage Sites.

The campaign is an upgrade of the decades-old roadside "warrior" marker program run by the Hawai'i Visitors and Convention Bureau, the agency HTA contracts to market Hawai'i in North America.

The new roadside markers combine the old red, brown and yellow warrior image with an additional panel that reads "Heritage Site of Hawai'i."

As well as the roadside markers, the campaign includes a guide on its website (www.gohawaii.com) in four languages with photos, descriptions and backgrounds of the various sites.

"Most of the sites have interpretive signage or tours to help educate visitors about the importance and history of the location," the HTA said on its website.

The sites:

O'AHU

• National Memorial Cemetery of the Pacific at Punchbowl

• World War II Valor in the Pacific National Monument at Pearl Harbor

• Diamond Head State Monument

• 'Iolani Palace State Monument

• Ka Iwi State Scenic Shoreline, Makapu'u Trail

• Queen Emma Summer Palace

• Nu'uanu Pali State Wayside

KAUA'I

• Kīlauea Lighthouse at Kīlauea Point National Wildlife Refuge

• Waimea Canyon State Park

LāNA'I

• Kaunolū Village

BIG ISLAND

• 'Akaka Falls State Park

• Kealakekua Bay State Historical Park

• Hawai'i Volcanoes National Park

• Lapakahi State Historical Park

• Pu'uhonua O Hōnaunau National Historical Park

• Kaloko-Honokōhau National Historical Park

• Pu'ukohola Heiau National Historic Site

MAUI

• Haleakalā National Park

• 'Iao Valley State Monument

MOLOKA'I

• Kalaupapa Lookout at the Pālā'au State Park