A mechanical clock built in 1914, with a rotation of 12 historical figures on its face.

This museum is dedicated to the little known ancient Roman history of Vienna.

The solemn exterior conceals an opulent interior of this 17th century church.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Dine amidst exotic plants at this former royal greenhouse.

The Habsburgs' royal collections of art and wonders.

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

Sturdy scales are a surprising thing to find in a modern European city.

Designed as a reminder of one of the darkest moments in Austrian history.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

Baroque celebration of the end of the Great Plague of Vienna.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

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

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

Once silenced for being off-key, this bell has found a new voice as an interactive public artwork.

This one-of-its-kind shipyard brings the 12th-century Viking Age back to life.

Charming small streets lined with well preserved wooden houses dating to the 18th and 19th century.

This handsomely carved wooden church is more than 800 years old.

In downtown Oslo, a menacing and terrifying relief clings to a church wall.

A microbiologist-chef is slinging noodles with hyperlocal Nordic ingredients.

An artist's mausoleum with a haunting echo.

This floating sculpture of ice is a poignant reminder of nature's power.