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

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

This hidden green space is the city's second largest conservatory.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

The world's largest collection of witchcraft regalia.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The monster at the center of the Darwin Center Spirit Collection.

Remnants of a Victorian garden feature sitting in public woodland.

A student driver's nightmare.

This 1920s Dutch barge is now a floating bookstore.

Colin Stokes "got a bit carried away" and built a castle that looks like something out of Tolkien.

A derelict bit of transportation infrastructure hidden in the woods.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

The topiary maze at the Habsburg hunting lodge.

Macabre museum devoted to historical Viennese murders.

The beautiful baroque library of the Hapsburg empire.

This former insane asylum now holds a pathological anatomy museum.

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

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

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

This abandoned Slovenian military barracks has become a punky-political art squat.