This remote site in the Australian Outback is where the British government conducted atomic bomb tests in the 1950s.

Alberta's Pipestone Creek Bonebed is one of the densest fossil sites in the world. This nearby museum showcases some of the best finds from its "river of death."

These submerged sculptures create a new habitat for marine life and exciting diving experience.

One of the breathing caves of Australia's Nullarbor Plain.

This freewheeling amusement ride is the last of its kind.

More than 12,000 years ago, this park was a playground for mastodons.

This magical trail takes visitors on a journey round miniature wooden houses on the picturesque Denmark River.

These Aboriginal fish traps are among the oldest human constructions in the world.

These tracks are believed to be from a panicked dinosaur stampede.

Dedicated to an "Unknown Man," this grave holds either the remains of a lovelorn suicide or a Cold War spy.

This once-booming gold mining hub was basically abandoned overnight.

A series of eerie metal stick figures are spread out over four square miles on the bed of a huge salt lake in the Australian Outback.

Started nearly 100 years ago, this science experiment just keeps on going, ever so slowly.

These Australian rock formations look like Martian beehives that have grown up out of the landscape.

White cockroaches and other cave species occupy this massive series of lava tubes.

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

This pair of Australian "waterfalls" appear to be falling straight across the land.

A clear example of the process of erosion in action.

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

A massive stairway that almost wasn't leads to one of Australia's most scenic vistas.

An Australian lake whose pink hue defies scientific explanation.

One of the oldest continuously operating amusement parks in the U.S. is an open-air museum of Art Deco and neon lights.

A carnivorous plant paradise in a serpentine bog.

Once one of the most polluted caves in America, now an environmental success story and a museum dedicated to caves.