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

Crumbling ruins mark the site of a couple's grisly murder in the woods.

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

The grand marquee of this abandoned Hawaiian theater remembers the building's elegant past.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A simple plaque remembers a California island massacre that claimed more than 100 lives.

This plaza at the end of the world teems with monumental tributes to a problematic history, and laser discs.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

The Underground Railroad passed right through this historic Brooklyn Heights church.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

What remains of the summer palace of King Kamehameha III.

This state park was once an important Native American cermonial center.

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

This campus chapel is Robert E. Lee's final resting place and a topic of debate about the legacy of the Civil War.

Nestled in the jungles of Vanuatu are the remains of what was once a cannibal oven.

This Mississippi seminary was the first in America to train Black Catholic priests.

Legends surround this jagged rock formation in the New Mexico desert.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

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

This historic building provides a powerful glimpse into the lives of Japanese Americans forced to relocate during World War II.

Formerly a lovely white sand beach this Hawaiian stretch is now a trap for countless tons of trash.

This 50-foot rock formation looked like a face that was once believed to be that of a Native American chief.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

This historic museum is home to a rare Confederate Chester Gun.