The site of the Wellington avalanche, one of the America's worst railroad disasters.

The fountain marks the area where hundreds of accused witches were burned at the stake.

This nature center has one of the largest collections of native raptors in the Pacific Northwest.

The last inhabitants of one of the U.K.'s most remote islands were evacuated in 1930.

Impressive sink holes fill this untouched old-growth forest in the Bahamas.

The only way to visit this old resort hotel is with scuba gear.

The tradition of using flowers to decorate wells is once again thriving in England.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

This headstone-like marker inscribed with three words has been an utter mystery for over a century.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

Crawling into this primordial cave may feel disconcertingly familiar.

A dark tunnel leads to a striking white crater that seems to be from another planet.

This oak sculpture at the edge of a small woodland is nine feet tall and shrouded in mystery.

On the highest peak in the Harz Mountains, science and the occult faced off in a failed attempt to turn a goat into a boy.

An enigmatic natural rock formation with a manmade passage cut through the center.

This abandoned fishing settlement may well be the greenest village in the world.

This is why we can't have nice things on the Incan Trail.

Medieval irrigation channels built into the sides of mountains provided Valais with water for hundreds of years.

This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

This Sumatran root bridge took almost 30 years to knit itself together.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

A beautiful, dense forest in the shadow of Mount Fuji, with a tragic reputation.

This former sugarcane transport tunnel is now a portal to a lovely beach.

This tiny lake temple dedicated to a water goddess seems to float on the surface.