Macabre astrological automaton clock dating to the late 1400s.

Physicist’s epitaph provides final confirmation to a career of turmoil.

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

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

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

This statue of a falling man commemorates a teenage martyr of the Hungarian Revolution.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

This hidden art nouveau gem was designed by an architect in search of a national style.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Museum dedicated to the terror regimes of Hungary.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

Once the home of a hermetic monk, this cave now houses a small church.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

The largest of London's subterranean rivers and once a mad, bad center of London life.

Famously misunderstood wonder of the ancient world

As one of the world's largest hydroelectric dams this plant took two countries to get built.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

The most loyal of little dogs, or a Victorian era publicity stunt?