A pink sandstone column once used in ancient times to measure one's belly after a night of debauchery.

This small chapel built into rock is the oldest place of worship in Luxembourg.

The official motto of Luxembourg reminds passersby of the Luxembourgish commitment to their national identity and sovereignty.

This memorial to a murdered empress took 20 years to design, then spent 30 years hidden away in storage.

One of the tallest lighthouses in the world also serves as a monument to the fallen of World War I.

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

This pair of unsuspecting buildings are in fact the very first modern skyscrapers in Europe.

There are hidden patterns on the subway seats of some Stockholm metro cars.

This legendary dessert was served to Nobel laureates for decades.

An abstract representation of weather in Sweden.

The palace for King Gustav III was never completed, but the foundation remains tucked away in this city park.

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

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

Hidden in plain sight, Sweden's official ordnance datum is now abandoned.

A 130-year-old urinal is the oldest of Stockholm and perhaps all of Sweden.

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

Enormous ants wielding giant pine needles guard a Stockholm real estate company's office.

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

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.

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

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

Legend has it this spring formed at the spot where a medieval Swedish king was killed.

Uppsala's adorable feline sign celebrates a popular children's book set in the Swedish city.

From Carthage's Hannibal to riders of the Tour de France, many have crossed this scenic route through the Alps.