Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.

A priceless collection of the Nation's cryptologic history.

The land is home to swimming ponies and a legendary 18th-century treasure.

An astounding collection of medical specimens, including bits of President Lincoln.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

The location of this small park was once the site of an infamous public morgue.

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

Babe Ruth and others planted saplings for a 1930s tourism campaign. The saplings grew as the area faded.

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

The historic Masonic Lodge in which the first-ever female Mason was initiated.

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.

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

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

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

During the summer months, giant teddy bears take over Paris near Les Gobelins metro station.

A haunting collection of the vanished and disappearing natural world.

This recessed garden protects thousands of mountain plants by creating its own microclimates.

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

The video game-themed street art first popped up in the French city.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the 20th century.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.