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

Inside this Icelandic greenhouse, geothermal energy keeps tomatoes warm and growing.

Three columns of volcanic rock shoot out of the ocean.

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

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

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

Medicinal spa created with the discharge from a geothermal energy plant.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

Home to items never before seen by the public.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

This spooky statue sits outside a famous Prague theater.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Macabre astrological automaton clock dating to the late 1400s.

This otherwise unremarkable ski town building marks the site of Butch Cassidy's first robbery.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Elevated freight railway turned wildly successful urban park.

This striking royal residence is the largest Renaissance-style castle in Scandinavia.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.