A massive underwater sinkhole made famous by Jacques Cousteau.

An exhibition devoted to the life (and posthumous taxidermy form) of the last known representative of the Pinta Island Tortoises.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Famously misunderstood wonder of the ancient world

The 20-mile causeway that separates the Netherlands from the sea.

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

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

A beach made of semi-precious green sand on the Big Island of Hawai'i.

This black shoreline is made up of exploded lava particles.

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

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

This legendary urban waterfall creates a dazzling display of rainbows.

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

Watch the newest land on the planet form before your eyes.

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

The spot where the namesake of the Douglas fir met his mysterious end on a Hawaiian volcano.

The ruins of a lighthouse on the island Amelia Earhart never reached.