The red letters in the literary pavement leading to the library form a mysterious code.

A spherical "micro-nation" in the heart of Vienna.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

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

Macabre museum devoted to historical Viennese murders.

Handsomely crafted representations of our round planet.

Museum devoted to the artificial language of Esperanto.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Inside the corridors of this flea market, visitors are sure to find some obscure and odd treasures.

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.

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.

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

These two 15th-century metal rods allowed people to check if they were swindled or not.

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

This underpass became an unlikely piece of cinematic history after its appearance in 'A Clockwork Orange.'

A recently restored substation that dates from 1875.

This stone spire holds a unique place in the region's history.

Remnants of a Victorian garden feature sitting in public woodland.

Abstract dinosaur models in London.

A sculpture of a famous ape who was once a beloved household name in London.

The remains of Crystal Palace Great Exhibition of 1851.