The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

Largest lake in Great Britain measured by surface area.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

This private residence was the template for one of the most beloved television homes of all time.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

An abstract monument to a symphonic composer.

These crumbling Latvian forts make for some haunting seaside ruins.

A black cat protests the City Guild in Riga's Old Town.

The oldest housing complex in Riga is a mini timeline of architectural trends.

3,000 market stands in five former Zeppelin hangars.

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.

The most powerful waterfall in all of Europe.

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

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

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

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

The hallucinogenic center of the ancient world.