Legend holds that this knife serves as a chilling reminder of the deadly rivalry between two local builder brothers.

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

The remains of Alfred Nobel's first nitroglycerine factory can still be found on the shores of a Swedish bay.

These airport hangars are now a bustling shopping center with only hints of its past still lingering.

According to legend, this boat-shaped henge is built over the grave of a mythic king.

A subterranean house of worship carved right out of the bedrock.

For six months of the year, three giant mirrors direct a pool of sunshine onto this otherwise occluded town.

This Swedish automobile graveyard is a beautiful gallery of decay, but woe be to any who would steal a souvenir.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

Swedish skyscraper with a 90° twist.

This Swedish astronomical clock was in storage for almost a century before its glorious workings were put on display once more.

This cobblestoned medieval-style town was entirely constructed in the 1990s and 2000s.

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

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

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

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

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

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

Healing waters from a holy well, previously used by locals for doing laundry.

An ancient Roman relief beautifully preserved on the façade of a house.

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

Model Trains and Much More in Hamburg.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

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