Mysterious lost empire of the Silk Road.

Ruins of the Crusaders' headquarters.

Yemen's "Stone Palace" looks like it was carved right out of the tall stone column on which it is built.

One of the most remote and isolated villages on the Arabian Peninsula.

A city built from mud and known as the "Manhattan of the desert."

The oldest Christian monastery in Iraq until ISIS blew it up twice and then drove over it with bulldozers.

A bloody history is captured in this former prison turned museum.

The sacred shrine of the Yazidis.

Auguste Maïcon, a pioneer in French aviation, was born in this house in 1891.

The tomb of a hard traveling saint is constantly covered in shoes as offerings to heal disabled youth.

Nearly every wall in this French villa has been "tattooed" by artist Jean Cocteau and other famous painters.

The largest crypt ever constructed in France was built in the 11th century on an ancient Druid sacred site.

Balconies that have a most unusual accent.

Trek up this glacier before it disappears.

This historic stone gate tower is now just a lonely relic in the middle of a swamp.

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

Thousands of flamingos and other bird species flourish in these Camargue wetlands.

Lady Liberty's original designer installed a little clone in this French fountain.

A tiny, forgotten park of surrealist sculptures in Angouleme.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

Abandoned blockhouses from Nazi Germany's Atlantic Wall erode into the sea on a French beach.

This statue honors the thousands of Allied avians that served and died for France during World War I.

Wall after wall of this French seaside neighborhood is intricately decorated with seashells and corals.

A crumbling island fortress that seems to be covered in a field of stone crosses but is simply incomplete.