The frozen bubbles that form on the icy surface of this Canadian lake contain enough methane to create a small explosion.

On the Oregon coast there is a natural hole that seems to be draining the sea.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

An eerie, derelict amusement park in Berlin.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

An exquisite tunnel of cascading flowers.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

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

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

An artsy hidden staircase leads to breathtaking views of San Francisco.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

An ancient stone wall formed by lava that was a frequent stop during funeral marches.

A small island abbey is the final resting place of many medieval Scottish monarchs, including the real Macbeth.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A huge musical instrument played by the ocean.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.