The last Tsar of Russia constructed this private church just so he could attend services when visiting his wife's hometown.

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.

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

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

The personal charnel house of Anton Bruckner.

"World machine" built by an untrained Austrian farmer.

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

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

The world's oldest known salt mine.

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

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

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

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

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

The world's largest collection of intentionally useless inventions.

Museum devoted to the artificial language of Esperanto.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

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

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

Ride a dragon train into a world of dwarves.

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

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

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