What remains of the summer palace of King Kamehameha III.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

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

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

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

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

Software company Epic Systems has created one of the strangest and largest workplaces of all time.

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

This little blue house pokes out over the campus of UC San Diego, seven stories high.

Monument to a brutal, ineffectual US bombing campaign and a sobering reminder of the human cost of the Vietnam War.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

This was once the center of the Birdman cult, and is now a World Heritage Site.

The world's most remote airport.

The largest stone moai on Rapa Nui.

The little bear in the "funny kind of hat" has made his way from London back to Peru.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

Commonly acknowledged as the only public monument to the Devil himself.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The world's largest wooden structure.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

A 15th-century granary that played the role of futuristic slave quarters in the world of 'Star Wars.'

The final resting place of the great navigator, or maybe his brother.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

A beautiful bamboo trail tucked in this famous Japanese Shrine.