"World machine" built by an untrained Austrian farmer.

Ride a dragon train into a world of dwarves.

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

An Austrian house of bones filled with hundreds of intricately painted skulls.

A rooftop restaurant hides in plain sight atop Vienna's Palace of Justice.

The Habsburgs' royal collections of art and wonders.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

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

The final resting place for the remains of 143 Habsburg royalty.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

A highly-criticized monument in Budapest has become the site of a makeshift Holocaust memorial.

The ruins of an early 1900s neo-Baroque mansion sit nestled in a local park in the Hungarian plains.

A much-loved sculpture depicting the hero of a 1956 anti-Soviet uprising.

For decades, Hungary's Communist Party insisted this gulag had never existed.

Hungarian Jews were ghettoized during the Second World War, but little remains of the original wall that closed the Jewish people off from the rest of the city.

An abandoned cable car station located on the Danube stands like a haunted house above the river.

A plaque bearing the names of those who dedicated themselves to protecting Budapest's Jewish population during World War II.

The only natural cave bath in all of Europe.

This sculpture honors the man who was known as the "Righteous Among the Nations."

The holes in this wall provide a glimpse into Jewish life in Budapest, both past and present.

A triumphant marble and bronze fountain depicting a 15th-century Hungarian king and his hunting party.

A 13th-century convent where St. Margaret of Hungary spent her teenage years.

The true meaning behind this sculpture remains unknown.

The metal leaves on this tree are engraved with the names of Holocaust victims.