This black shoreline is made up of exploded lava particles.

A true treehouse near Hawai'i Volcanoes National Park.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

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

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

Hoax, mistake, or evidence of dinosaurs in human times?

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

A sculpture of a salmon swimming through a brick building.

Statues of Ramona Quimby, Henry Huggins, and Ribsy the dog in the park where their adventures "really happened."

Gigantic private toy museum featuring among finest collections of antique mechanical banks in existence.

Delightful disarray of found objects and clutter.

Their motto is, "We've been bonkers for hats even longer than you have!"

Private collection of art inspired by cabinets of curiosity.

A beautiful 62-acre Catholic shrine and botanical garden.

A heavenly experience, right here on Terra Firma.

An emporium for the weird, creepy, rare, and just plain gross.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

A French-Colonial era collection of taxidermy and wet specimens, secreted away in the National University of Hanoi.

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

The notorious "Hanoi Hilton" where Vietnamese colonial subjects and later American POWs, including John McCain, were imprisoned.

The mysterious empty cupola behind the monumental arch points to an ancient prophecy of Delhi.

A startling, centuries-old subterranean marvel hides in plain sight.

Ornate, dome-topped cenotaphs fill this royal crematorium.