A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

This historic hotel preserves many treasures from its heyday hosting passengers on the Orient Express.

Have tea in a cemetery with a dazzling view of Istanbul.

Climb a set of vertiginous stone steps to the top of this impressive ancient edifice.

Byzantine emperors ruled, lived, and died in this 13th-century palace-turned-museum.

It's believed that this small church was connected to the Hagia Sophia via a secret tunnel.

The only Roman honorific column in Istanbul.

A sixth-century Byzantine cistern hidden below a modern carpet store.

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

A section of the long chain that blocked enemy ships from entering Constantinople.

A Very Low Frequency transmitter you can tune in on your PC.

A stunning architectural yet functional feat, towering over Oslo.

This handsomely carved wooden church is more than 800 years old.

The painter of "The Scream" is laid to rest under a stoic bust of himself in the humble corner of an Oslo cemetery.

This floating sculpture of ice is a poignant reminder of nature's power.

The grounds and buildings of an old wood pulp mill have been transformed into an innovative art park and museum.

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

A concrete mushroom that divided Stockholm residents for nearly a century.

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

This pair of unsuspecting buildings are in fact the very first modern skyscrapers in Europe.

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