This three-chambered cave is the only protected natural bat hibernaculum in Quebec.

An abandoned town centered around a paper mill powered by a large waterfall.

A lake formed in the basin of a massive impact crater takes the shape of an unbroken ring when viewed from above.

This downtown Dallas art installation is always on the lookout.

Not for the faint of heart, this long pedestrian bridge rewards those who brave the wobbly walk with a beautiful view.

Despite being dead since the 1970s, this Canadian tree is kept upright and intact by adoring locals.

A rescue facility that caters specifically to wolf-dog hybrids, and educates about these unique animals.

Historic site where Native American hunters once trapped and killed buffalo.

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

This natural wonder is disappearing at an alarming rate.

Every fall this lake mysteriously drains, like a bathtub with the plug pulled out.

The half-mile long structure is so impressive, it even shows up on satellite images.

A surviving remnant of the thick ice mass that once mantled most of Western Canada's mountains.

What was to be the world's most secure Cold War document vault ended up as just a few shallow caves.

The world's largest dark sky preserve is a Canadian park established to preserve the country's last wood bison.

The ruins of the "20-year town" lay out among the mountains of Alberta.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

Ruins of a German Castle on top of a towering stone pillar.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

Started as a kitchen garden, now the second largest botanical garden in the world.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

The fairy tale castle of the "fairy-tale king."