Long before ultrasounds and modern testing, medical specimens like these conjoined twins helped physicians learn about congenital anomalies.

A novel collection of medical curiosities housed in an 18th-century surgeon training academy.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

This ordinary street was made infamous by a legendary visit from the devil.

Bored potato-guarding Nazis etched their thoughts onto a brick storage building in Copenhagen's Meatpacking District.

Hans Christian Andersen for the postmodern world.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

A collection of objects supposedly singed by the hands of souls in purgatory.

The underground sanctuary of a mysterious ancient cult.

The yawning maw of this pagan visage is said to bite off the hands of liars.

An alchemist's "magic door" stands in the middle of a Roman park.

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

A fortress on this island housed the mysterious prisoner known as the "Man in the Iron Mask" for more than a decade.

A uniquely robust and historic look at Mexico's omnipresent dance with Death.

A look into the Church of Scientology's deeply unfavorable view of psychiatry.

World's largest collection of serial killer artwork and other macabre exhibits.

A collection of oddities including Dr. Kevorkian's suicide device, the Thanatron.

The remains of what was the most important religious complex in coastal Peru for over a millennium.

The location of the last witch trials of Italy, known as "The Salem of Europe."

This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.