The composer known as the "Swedish Mozart" arranged to be buried in an unusual spot.

This giant temperature attraction created some giant electric bills.

Thousands of turbines whir at the origin of North American wind power.

Where a railroad loops under or over itself to rise or drop more than 70 feet in a short distance.

Four hundred granite steps were built into this massive rock by the National Park Service.

A public work of art that also provides some relief from the summer heat.

Inspired by the Rialto Bridge in Venice, these three clustered bridges were just one part of a Slovenian architect’s grand vision.

This abandoned Slovenian military barracks has become a punky-political art squat.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

One of the largest squares in Europe contains an entire artificial island.

Pilgrimage site for star-crossed lovers.

"There's nothing there," and other lies the KGB told us.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

A railway, a waterway, and a roadway all in one, suspended over a rushing river.

Old ruins of a church from the 1200s.

A centuries-old copper mine that once provided two thirds of the world's copper supply.

This Stockholm art museum integrates many of its pieces into the surrounding outdoor areas and natural landscape.

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

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

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

Several cannonballs of mysterious origins decorate two buildings in Stortoget's main square.

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

This poured-concrete water reservoir is a gem of modernist architecture well-hidden in a city forest.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.