A modern, secular take on a traditional Virgin Mary motif.

The dome-shaped reservoir of this old water tower produces unique acoustic effects.

This Scandinavian island is the site of the first modern observatory.

Every Tuesday, students let off steam by screaming into the night air.

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

This castle ruin in the middle of nowhere is a gem for wildlife enthusiasts.

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 first ‘Harry Potter’ film.

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.