A massive underwater sinkhole made famous by Jacques Cousteau.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

The jewel of western Mexico's archaeological legacy is this tiered circular pyramid now covered in grass.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

The winter home of millions of migrating monarch butterflies.

An obscure waterfall that looks like something out of a fantasy novel.

A 1940s nuclear reactor built to produce plutonium for the Manhattan Project.

The victims of a free-floating Japanese bombing during WWII are remembered by this stone monument.

Along the Outback Scenic Byway, adjacent to hot springs, this human-made geothermal feature takes unexplained breaks.

At this airport "microcinema," you can catch a film before you catch a flight.

On East Burnside, a 24-hour vending machine distributes world-class pastries.

The magic's in the hole!

This black shoreline is made up of exploded lava particles.

The world's last remaining store of its kind.

Fifty years after a “blast blasted blubber beyond all believable bounds,” this idyllic natural area commemorates the carnage.

This church, buried halfway in lava rock, is all that remains of a Mexican village destroyed by a volcano.

One of Mexico's rare urban natural parks features waterfalls and a working fish farm.

66,000 pieces of art, donated by one of the world's richest men.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

Frida Kahlo's childhood home, now a museum of her life and works.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

Stroll through a wonderland of stupendous moss-covered trees.

The tale of a strong-willed woman who stood her ground when the commercial world came rumbling in.

A "sinister, whimsical, tacky, and really orange" public art installation hidden under a Seattle bridge.