Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

Dine amidst exotic plants at this former royal greenhouse.

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.

Designed as a reminder of one of the darkest moments in Austrian history.

On a winding Vienna side street, one museum has turned their windows into a monument to history’s peace-minded heroes.

One of Vienna’s oldest (and perhaps most haunted) alleys, allegedly with a bloody past that gave it its name.

Legends surround an ancient tree trunk riddled with nails for good luck.

Rediscovered underground chapel is one of the best examples of Gothic architecture in Vienna.

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

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

A monument dedicated to a lone, brave invader.

This museum is dedicated to the little known ancient Roman history of Vienna.

A mechanical clock built in 1914, with a rotation of 12 historical figures on its face.

A silly medieval mural preserved on the side of a Viennese house.

The solemn exterior conceals an opulent interior of this 17th century church.

An exquisite Baroque church in Vienna's old town.

These relics of the city's past now exist as a prominent modern feature.

This 50-foot-deep sinkhole created in the 14th century is home to rare plants and fungi.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

Enigmatic tombs and cave dwellings on the outskirts of a rural village.

These 19th-century military fortifications spanning the island of Malta now form a nice countryside hiking trail.

At more than 5,000 years old, these structures are among the oldest free-standing stone buildings in the world.

These purpose-built WWII air raid shelters, which run half a kilometer under the town of Mellieħa, are among the longest in Malta.