More than 5,000 contemporary and "historic" mustards from around the world.

A large circus museum with summer performances.

An exquisite Baroque church in Vienna's old town.

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

Museum devoted to the artificial language of Esperanto.

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

Handsomely crafted representations of our round planet.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

One of the most controversial statues in Romania is an emperor with no clothes.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

A spherical "micro-nation" in the heart of Vienna.

The Habsburgs' royal collections of art and wonders.

A silly medieval mural preserved on the side of a Viennese house.

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

The topiary maze at the Habsburg hunting lodge.

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

Terrifically morbid cemetary and site of famous Paracelsus' grave.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

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

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

Op-art architecture designed for happiness.

The beautiful baroque library of the Hapsburg empire.