This disused boat elevator was saved from the scrap heap so that visitors could tour its rusting skeleton.

An underground city of ancient quarry tunnels hid thousands of Allied soldiers in WWI.

The 16th-century church was kept in its ruined state as a reminder of the casualties of World War I.

A monument to the thousands of Canadian soldiers who died capturing the French ridge during World War I.

This is what trains will look like after the zombie apocalypse.

Eat a Nobel banquet from any year in the basement of Stockholm's City Hall.

This small museum nestled inside a souvenir shop is dedicated to Sweden's most well-known toy.

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

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

Maybe the only restaurant in the world where your seat will be signed by a Nobel laureate.

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

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

Sweden's oldest animated sign is still lighting up the skyline today.

This unique sculpture is often overlooked by pedestrians.

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

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

This centuries-old rooster survived a devastating fire.

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.

Stockholm's tiniest statue is of a small boy looking at the Moon.

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

Absolutely no saxophones in the library.

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

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

The apartment where Pippi Longstocking came to life.