A former travertine mine traces the geological history of this unique desert filled with crystalline blue pools.

In a strange timezone anomaly, Daylight Saving Time here sets the clocks forward just 30 minutes.

This dramatic sea spire is home to the world's rarest insect and is part of the lost continent of Zealandia.

Climb right into the heart of this colorful Iceland volcano.

A winding, blood-red tunnel of hardened lava navigable by foot.

Colorado's only active volcano last erupted around 4,000 years ago.

A rapidly disappearing glacier filled with extinct grasshoppers, perfectly preserved in the ice.

Inside this mountain lies several kilometers of breathtaking caves.

Microscopic fossils suggest Australia may be the birthplace of sulphur-based life forms.

Spectacular rock formations host dinosaur footprints and an old hydrotherapy pool.

The "Bridge Over the Atlantic" lets you cross the waterway in mere seconds.

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

On a corner of the Ardmeanach peninsula on the Isle of Mull, a 50 million-year-old fossil tree hides in the coastal cliffs.

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

The largest collection of artifacts from the Olmec civilization, the mother culture of Mesoamerica.

The site where the Spanish first landed in Mexico was once a thriving Mesoamerican city.

Palace, temple, and pyramid ruins mark the ancient Mesoamerican capital of Totonacapan.

The oldest observatory in West Australia.

A beautiful hike through national parks, forests and beaches in Western Australia.

A feat of railway engineering required to bypass a muddy quagmire.

This memorial to a family's dead son has survived a century of hurricanes and earthquakes.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

This beach pool offers a spectacle of crashing waves, blue hues, and a historical lighthouse.

The short hike is worth the stunning views and crystal blue waters of a secluded beach.