This 19th century cyclorama acts like an analogue time machine to a different era.

Mozart's skull may be held in this collection, but definitive proof continues to elude scientists.

Archduke Ferdinand II's collection of rare objects is considered one of the oldest museums in the world.

This skeleton-filled altar piece served as a backdrop to one of the most iconic scenes in "The Sound of Music."

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

This grand manse has been transformed into a museum devoted to one of the founders of Fantastic Realism.

The personal charnel house of Anton Bruckner.

The medieval network of canals hidden underneath the city is opened to explorers each year.

A patriotic medieval knight in driven-nail armor raised money for widows and orphans of WWI.

The amazing wonder cabinets of a very rich Austrian archbishop.

"World machine" built by an untrained Austrian farmer.

The world's oldest known salt mine.

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

This series of underground chambers contains Europe's largest subterranean lake that is slowly drained each day.

American soldiers discovered Europe's best one-liner at the end of World War II.

The shell of a medieval fortress offers commanding views of the area it once protected.

The world's largest collection of intentionally useless inventions.

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

Museum devoted to the artificial language of Esperanto.

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

Visitors dip into a variety of pools of what was once ice.

A neo-Gothic mansion now houses a wunderkammer of analog tech that hits on all the senses.

Collection dedicated to funeral rites, equipment, and mourning rituals of the Viennese.

The Habsburgs' royal collections of art and wonders.