An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

One of the last remaining railway viaducts equipped with a transporter ferry.

The world's first and only three-segment bascule bridge folds up into the shape of a capital "N" to let boat traffic through.

An art installation composed of items left behind by beachgoers.

A tiny town hall—in Sweden's one-time capital—might be the smallest in Europe.

Sweden's southernmost point is located in this charming fishing village.

A Gothic-inspired fish market is Gothenburg's best place to find loaves and fishes.

Archaeologists are still unraveling the secrets of the brutal massacre that wiped out this ancient fort.

Swedish skyscraper with a 90° twist.

This chimerical bridge/tunnel appears to dead end right into the sea.

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

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

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

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

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

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.

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

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.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

Macabre astrological automaton clock dating to the late 1400s.

An impressive monument to Poland's independence.