This Art Deco masterpiece has stood in for some of the most famous buildings in comic book history.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

This expansive bridge in the Canadian wilderness was originally just built for friends.

One of the world's first dedicated bank buildings in the world is now the oldest one.

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

Small Easter eggs are hidden in the ventilation holes of the city's newest trains.

The Swedish flag over this small naval fort signals that the nation is at peace.

A 12th-century church with a medieval fresco and an intriguing “Greek runestone.”

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

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

Stockholm's narrowest alley is barely over two feet wide.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

This homeless brass fox tugs at your heartstrings from the foot of a Stockholm bridge.

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

Stockholm's deepest subway station is also a stunning ecological wonder.

The library's graceful rotunda is like a bibliophile's temple.

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

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

A 15th-century monumental Latin inscription on this house celebrates Lorenzo Manilio's love for Rome.

A large replica of a monumental Roman inscription is located on the side of this museum.

The Italian revolutionary's legendary wife is portrayed on horseback waving a gun and holding her child in this memorial on the Janiculum.

An ancient Egyptian obelisk is now used to commemorate fallen Italian soldiers.

This medieval church in Rome was almost destroyed following a terrorist attack in 1993.

These ruins of a Phoenician sanctuary in Sicily have a dark history.