Paranormal activity on the great lakes.

Three playfully immersive mini golf courses let you travel alongside your ball to the cup at this facility, which has been around since the 1950s.

Built in France in the 1400s, this gothic chapel now resides at Marquette University in Milwaukee, Wisconsin.

Picturesque and haunting, these 160-year-old stone ruins on top of a bluff are the only remains of a settler's legacy.

The remains of a 13th-century Romanesque church lie abandoned on a hillside.

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.

A relic of the Cold War tucked away in the forested hills above Bratislava.

A once-fairy tale mansion now stands in a state of disrepair.

A line of disused military bunkers built to defend against Nazi invasion lies hidden on the outskirts of the city.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

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

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

Op-art architecture designed for happiness.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.

Macabre museum devoted to historical Viennese murders.

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

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

Bizarrely-painted church designed by a controversial artist.

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

Site of the 1889 murder-suicide of crown prince Rudolf and his lover Mary Vetsera.

In a crypt underneath this church lies a naturally mummified vicar whose story is surrounded by mystery.

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

Terrifically morbid cemetary and site of famous Paracelsus' grave.

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.