Roman ruins top white travertine terraces formed by ancient hot springs.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

Dramatic river bend surrounds a natural red-rocked pedestal.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

Northern Ireland's Brobdingnagian stepping stones.

A beautiful geyser under environmental threat.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

Walk behind a 50-meter-high waterfall.

A stunning silver lining to global warming's gloomy cloud.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

Arcadia is home to a haven for nature geeks and 80s TV lovers alike.

A nursery specializing in strange and beautiful succulents and cacti.