Cairns built to bring travelers good luck stretch across the land like miniature stone mountains.

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

This wrecked airplane has been sitting on a black sand beach since the 1970s.

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

Three columns of volcanic rock shoot out of the ocean.

Icelandic folklore says this giant boulder was ripped from the mountains and placed at its current location, where it became home to elves.

Along this wire fence, travelers have been leaving a particular memento since 2012.

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 Hveragerði fissure runs through this unassuming shopping center.

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

This stunning concert hall has become a symbol of Iceland's national recovery.

An encyclopedic collection of mammal penises.

This tiny museum's sizable collection is jammed into a former underground public toilet.

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

The ruins of an 11th-century Norman castle with a rare, perfectly circular shape.

The largest greenhouse in the world is home to over one million types of plants.

400-year-old garden, restored to beauty.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Amsterdam's former hotspot for public executions and dissections.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.