This impressive coastal fortress was destroyed before it was finished.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

The great polar explorer is remembered in this far northern town, where he embarked on his final expedition.

A 246-foot-high revolving restaurant rises unexpectedly from a forested Finnish hilltop.

The last surviving submarine from a strange chapter of Finnish history.

This restaurant combines two Finnish traditions in one place: warm-weather relaxation and outdoor carpet-cleaning.

A small island dotted with old, historic Finnish buildings.

Visit Finnish architect Matti Suuronen's first UFO-shaped home.

The world's first and only escalator for lazy bicycles and their daunted riders.

This misspelled graffiti reappears every time it is removed.

The grandest stage for the world's foremost masters of invisible instruments.

Roughly 17 million letters to Santa have found their way to this Arctic Circle post office.

Rent out a glass igloo to watch the Northern Lights like you live in the future.

This disused church, left to the elements of the Arctic Circle's forests is open for exploration.

Traces of a Sami settlement and sacrificial site dating back more than 9,000 years.

Norwegian explorer Roald Amundsen's airship docked here before leading the first-ever flight over the North Pole.

The people murdered during a 17th-century Norwegian witch hunt have been honored with a pair of stark, modern installations.

According to the locals, the sands of this secluded Norway beach are infused with gemstone particles.

A stoic sculpture that overlooks the waters.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

Visitors dip into a variety of pools of what was once ice.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.