For a couple of months each year this Swedish city turns into a festive neon phantasmagoria.

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

Tiny Swedish village with a distinct local phenomenon known as an "Elk Shower."

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

An artist's mausoleum with a haunting echo.

Stay overnight in the world's most sleekly designed rabbit hole, free of charge.

A favorite with sightseers, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

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

Walk 2,300 feet above the ground on the "Troll's Tongue."

Walk behind a 50-meter-high waterfall.

Oslo's historic toboggan run has been letting thrill seekers slide from train stop to train stop for over a century.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

Tens of thousands of tiny bottles stuffed with various items.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

No one knows who's responsible for decorating this tunnel with stuffed animals, but the people love it enough to protest their removal.

A former suicide bridge is now accumulating symbols of love instead of a body count.

The library's graceful rotunda is like a bibliophile's temple.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

A golden plaque marks the site of the mysterious unsolved assassination of the former Swedish prime minister.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

Although rarely used, there is still a hidden room for the royal family at the Stockholm central station.

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

This homeless brass fox tugs at your heartstrings from the foot of a Stockholm bridge.

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.