This church also serves as a lighthouse complete with a beacon.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

A subterranean house of worship carved right out of the bedrock.

A concrete mushroom that divided Stockholm residents for nearly a century.

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

A Stockholm metro station is home to an escalator that is not only the longest in Sweden, but among the longest in the world.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

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

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

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

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

Established in 1638 to battle the Black Death, this botanical garden is a treasure trove of rare flora.

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

Instead of solid circles, the stoplights in this northern Icelandic town have glowing red hearts.

The most powerful waterfall in all of Europe.

This monumental Jesus is often referred to as "Our Milk Carton With Arms."