This fantastical waterfall is hidden in a cave located in a cracked cliff.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A modernist landscape of water and sci-fi concrete.

This frequently-photographed waterfall takes only a short hike to visit.

The world's longest known cave system.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

A beautiful 62-acre Catholic shrine and botanical garden.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

Hollowed out cedar log tubs set in an ancient towering forest.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

A beautiful geyser under environmental threat.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Northern Ireland's Brobdingnagian stepping stones.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

Rising from the sea like a stone monster.

A winding path built in secret on the edge of the continent.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

A hand-built folk art installation covered with messages of God's love.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Elevated freight railway turned wildly successful urban park.