This innovative steam machine was no doubt the most famous of the pioneer locomotives.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

This aircraft museum is home to one of just three Halifax bombers in the world.

WWII artifacts, including the building itself.

Follow the original medieval paths that wind through this intriguing section of the city.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

Its interior is adorned with some of the best examples of early Christian mosaics.

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

An ancient knight and a symbol of the city's freedom.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

A surreal statue honoring Prague's favorite literary son.

Macabre astrological automaton clock dating to the late 1400s.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Baroque celebration of the end of the Great Plague of Vienna.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

A whimsical bridge adorned with decorative dragons.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

This unusual hostel provides a glimpse of life in a city under siege.

Oriental bazaar in the heart of Sarajevo.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

The place where World War I began.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.