The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

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

A giant red chair bolted to a rock on a remote mossy hillside in Iceland.

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

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

Three columns of volcanic rock shoot out of the ocean.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

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

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

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

Amsterdam's former hotspot for public executions and dissections.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Hamburgers are intensely proud of their tunnel beneath the river.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Copenhagen's celebrated theme park and gardens.

These lush botanical gardens employ the most purrfect pest control force.

Golden Gate Park's historic collection of plants.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

An alley covered with 20 years of bubble gum.

A second generation sun-powered marvel lights up the night.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.