It was meant to help transport wounded soldiers to a secret underground hospital.

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

Iron Age grave stones and Viking burials, a short drive from Gothenburg.

Hundreds of mossy stones engraved with bits of philosophy, literature and random musings.

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

A peat bog in southern Sweden provides a cozy and photogenic home for junked Volvos, Saabs, and the occasional American muscle car.

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

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

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

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

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

This Stockholm light tower can be controlled by anyone with a smartphone.

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

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

The largest fountain in Bratislava.

Also known as the Blue Church, the building was consecrated to the daughter of Andrew II.

Thousands of slain Soviet soldiers are buried within the shadow of this enormous obelisk.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

This Transylvanian church has changed its denomination four times.