A beach made of semi-precious green sand on the Big Island of Hawaiʻi.

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.

A model of a galactic embassy is hidden in plain sight along the highway, proposed by a UFO religion to find the aliens that created life on Earth.

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

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

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

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

This scenic gorge is named after one of the most famous Bigfoot attacks in pseudohistory.

The highest point in Washington state is a volcano covered in glaciers.

An old-timey peepshow allows visitors to gawk at some of the world's most freakishly large footwear.

A wall of chewing gum moonlights as collective art.

This working class sculpture pounds his hammer all the livelong day.

This Soviet-era "closed town" was a top secret uranium producer often left off of maps.

A series of tiny artificial islands rich with produce bob atop the surface of the lake.

It has an American Dream Car exhibit, Europe's largest Formula One collection, and many, many mannequins.

The building's fluid, wavelike walls are a true feat of architectural ingenuity.

The widest waterfall in Europe is a natural wonder and one of the only places where fish are caught in the air.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

The only museum with its curator—and her pets—buried inside.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.