Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

As the highest point in the Mid-Atlantic range this stratovolcano offers spectacular views.

There has been an astronomical clock on this spot since the 14th century.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

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

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 elegant arc of a waterfall marks a religious turning point.

The most visited, and possibly most controversial, museum in Germany.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

Largest island in the Baltic Sea experiences such idyllic weather that roses bloom in the middle of December.

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

Puffin enthusiasts flock to Europe's largest seabird cliff, which over one million birds call home.