This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

This elegant arc of a waterfall marks a religious turning point.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

Walk in the footsteps of the gods and straddle two tectonic plates.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

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

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

A massive bur oak tree believed to be some 500 years old is the centerpiece of this quiet urban greenspace.

A collection of 11 million buttons illustrates the human toll of the Holocaust.

The final resting place of New Orleans' most famous voodoo priestess.

This "second" cemetery represents New Orleans' attempt to keep cholera at bay.

This float factory takes the mask off of Mardi Gras and lets visitors see where the magic happens.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

The world-record holder for the longest bridge stretching continuously over water.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

This grubby wall is said to be one of the Earth's esoteric energy centers.

The blinking light atop the iconic landmark has been sending secret messages for decades.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Today this bizarre rooftop phone booth seems like a piece of kitsch but it was once used to spot disastrous storms.

A flooded Mexican cave that hides a river beneath the water.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.