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.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

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

Iron Age "bog person" preserved for over 2,300 years.

This Danish rock field is actually a sprawling ancient cemetery holding the bodies of 700 Vikings.

An abandoned lighthouse awaits its destiny: being buried under shifting sand.

In a city of wooden houses, this watchtower was vital for early fire detection.

A former factory now pays tribute to a local industry fueled by sardines.

This 65,000-ton glacial boulder stands as a striking natural monument.

Despite the groans of archaeologists, this astounding groups of Bronze Age petroglyphs have been painted red for tourists.

This castle ruin in the middle of nowhere is a gem for wildlife enthusiasts.

A statue of the heroic plumber stands outside a company that bluffed its way into being Nintendo’s Scandinavian distributor.

Walking through this narrow gorge will make you feel like you've fallen into a fairytale landscape.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

The marker that allows students all over the world to be late for class.

The standard measure of Lagom, a measure of what is enough.

The Lund University's former gym houses a museum focusing on the creative process of art.

A living descendant of the famous tree that helped Isaac Newton develop the theory of gravity.

This Swedish astronomical clock was in storage for almost a century before its glorious workings were put on display once more.

Could this controversial parietal bone be the remains of the famed French philosopher?

These ancient rune stones plucked from the countryside now call this university park home.

This Fifth Avenue church has long been the favored worshiping place of Broadway actors and vaudeville performers.

A popular European tradition makes its way to the states on one of America's most famous bridges.