This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Where commuters walk through remnants of an ancient Greek necropolis.

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

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

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

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

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

Three columns of volcanic rock shoot out of the ocean.

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

This beautiful, historic church looks like something out of a simpler past.

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

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

Former self-sufficient mental institution now a planned community.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

The curious underground history of keeping Paris clean.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

The celebrated eyesore created by starry-eyed sweethearts.

France's national museum of scientific and industrial instruments.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The headquarters of one of the world’s longest-running humor magazines bears a noticeable resemblance to a head wearing a Prussian helmet.

Lovingly nick-named the "Brick Dick" this municipal tower was winner of the World's Most Phallic Building Contest.

Sitting in the arguable birthplace of the Wild West, this museum holds the largest collection of bronco busting bric-a-brac in the world.