St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Millions of glowing microscopic organisms light up the waters of this luminous lagoon.

A large collection of ancient runestones decorates this university courtyard.

A rare rune stone dedicated to a woman.

The official meeting point for the oddly named governing assembly of ancient Sweden.

Ancient burial grounds of the wealthy.

This mysterious runestone embedded in a church wall is linked to the medieval cult of Saint Erik.

A small church in Uppsala hides the grave of a renowned 18th-century astronomer.

18th century opera in its original splendor.

A water reservoir disguised as a castle stands atop a hill in a park in Stockholm city.

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

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

Sweden's "good old days" painstakingly re-created in a model village.

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

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

This unique sculpture is often overlooked by pedestrians.

The only surviving piece of Copenhagen's 16th-century defensive wall.

The final resting place of one of the brightest physicists of the 20th century.

The final resting place of the author who gave us the Little Mermaid, the Ugly Duckling, and many more beloved fairy tales.

A Japanese video game arcade hides in the back of a Swedish pool hall.

This giant subway sculpture celebrates the fruit that inspired the theory of gravity.

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

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

The 19th-century home of Count and Countess von Hallwyl is now a museum.