Europe's official "zero-level," the equator of elevation.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

This cheese shop also houses a museum devoted to Dutch dairy.

The last of Amsterdam's original sea level markers remaining in place.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

This floating sculpture of ice is a poignant reminder of nature's power.

When this 18th-century observatory's meridian was moved, it set Sweden's time back by 0.04 seconds.

A miniature model of the iconic Stockholm department store.

What looks like a birch tree smushed between two pieces of glass often confounds commuters.

Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

This grisly exhibit houses skeletons and weapons from a devastating 14th-century clash.

It houses the remains of a 17th-century version of the Titanic.

This statue and park honor the Swedish chemist Jacob Berzelius, one of the founders of modern chemistry.

A collection documenting Nazi occupation of Norway, including a painting believed to be made by Hitler.

This functioning parish church is also the site of many concert performances due to its wonderful acoustics.

The great polar explorer is remembered in this far northern town, where he embarked on his final expedition.

An ancient Egyptian temple in the middle of Madrid, Spain.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

These crudely shaped folk giants may be the the second most photographed statues in the U.S.

Macabre museum devoted to historical Viennese murders.

Baroque celebration of the end of the Great Plague of Vienna.

The design of this beautifully crafted building was inspired by Norwegian glaciers.