The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

An artsy hidden staircase leads to breathtaking views of San Francisco.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A huge musical instrument played by the ocean.

This saltwater swimming pool, which is the last of its kind in the United States, is slowly crumbling within sight of multiple high-end beachside hotels.

This monument built by Japanese American immigrants spent decades underground.

Hawai'i's oldest wooden house was shipped around Cape Horn from Boston in 1820.

A unique collection of Western and Japanese-style graves.

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

Hiding in plane sight.

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

An ode to one of the first concerts broadcast via satellite.

This Hawaiian cattle ranch acts as a museum devoted to the island cowboys that predate the wild west.

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

During the solar phenomenon "Lahaina Noon" this bendy, curvy sculpture forms a perfectly circular shadow on the ground.

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

More than 2,000 species of tropical plants call this nature preserve and sanctuary home.

A unique set of caves that spits waves back out into the ocean.

This narrow coastline trail through the dense Kauai wilderness is among the most beautiful and dangerous in the world.

This unusual lava tube spouts seawater during high surf.

This blowhole is supposedly caused by a trapped monster.

This mom-and-pop Japanese sweets shop has been serving cloud-light mochi for almost a century.