This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Europe's largest community of crocodiles and alligators.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

The remains of the medieval wall that once surrounded Paris with ties to the construction of the Louvre.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The Sun King's military models, saved from the Louvre.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

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.

This place bears witness to the loss of many lives during WWII, and stands in stark contrast to the American Cemetery.

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

The Tudor-style cottage in the middle of the square is not quite what it seems.

This bewitching Babylonian goddess haunts a hallway of the British Museum.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

One of America's founding fathers lived in this London lodging between 1757 and 1775.

Victorian-era Londoners really wanted to believe this 17th-century cistern was actually an ancient artifact.

This ancient Egyptian obelisk still bears the wounds of World War I.

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

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

This symbol of the French Revolution still stands where it was first planted during the 18th-century.