Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

Most often copied TV Tower in the world.

Money made from smuggling sugar helped create this wondrous rock maze in honor of the Prussian Queen Louise.

A preserved Nazi labor camp now has a Holocaust museum on site and memorials to the thousands that died while imprisoned at the camp.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

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

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

Baroque celebration of the end of the Great Plague of Vienna.

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

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.

Op-art architecture designed for happiness.

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

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

This former insane asylum now holds a pathological anatomy museum.

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

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