These unique markers designate the route American forces took during the Liberation of France.

Bloodstains can still be seen in this medieval church where two medics saved lives on D-Day.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

This elaborate High Victorian Gothic structure is one of the world's few 16-sided buildings.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

An effigy of a trapped paratrooper dangles from a Normandy church to commemorate one remarkable D-Day event.

Climb right into the heart of this colorful Iceland volcano.

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

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.

Yo, Adrian!

A daily replay of the experiment that proved the rotation of the Earth.

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

A restaurant devoted to "trouser grip" wrestling, an ancient form of Viking wrestling that is Iceland's national sport.

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

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

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

This beloved marketplace mascot poops money and grants good luck.

A beautiful geyser under environmental threat.