The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

This natural "sea of stones" was once used by the Romans as a quarry.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

A former Nazi lookout tower with a magnificent view of the Rhineland.

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

A German apartment building hosting as many trees as human occupants.

The zoological collection at the Hessisches Landesmuseum hosts some of the world's oldest habitat dioramas.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

An Austrian house of bones filled with hundreds of intricately painted skulls.

A breathtaking viewing platform over the Alps.

A meteorite-bounded town in Bavaria.

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

A unique hotel for the artistic soul.

Also known as the Blue Church, the building was consecrated to the daughter of Andrew II.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

Artfully arranged bones of 5,800 Austrians.

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

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

The beautiful baroque library of the Hapsburg empire.

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

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

An exquisite Baroque church in Vienna's old town.

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

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