This massive and unusual rock formation near Okotoks is the world's largest known glacial erratic.

An abandoned Cambodian resort that mirrored the downfall of the country as it was happening.

Dedicated to improving the plight of the rare scaly anteater.

Space-age monument to an early 20th-century uprising.

The scuba diving training facility was named for the steam that rises from the cave's chimney.

A high point in Vancouver kitsch.

Stay in a room with a view... of the bottom of the ocean.

The famous boat that once ferried Bogart and Hepburn still floats in Key Largo after being abandoned for years.

A memorial to the unknown and unheralded men and women of the Cold War military and intelligence services.

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

A miraculous natural phenomenon known as "the spring that breathes."

A proto micro-nation sometimes populated by artists, surrounded on all sides by a Utah most barren.

This long, dark tunnel is open to hikers, but those without lights are known to get confused even on the straight path.

Tour the original street level of Port Angeles, buried underground in 1914.

The largest lake in the Faroe Islands seems to be held hundreds of feet above sea level thanks to an optical illusion.

A trio of hidden hot tubs takes advantage of Iceland's natural geothermal vents.

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

This geothermal hot spring hides beneath a slowly growing mineral dome.