An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

The world's only museum devoted to the wonders of fluorescence.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

The house that took a plunge into the facade of a museum.

A rooftop restaurant hides in plain sight atop Vienna's Palace of Justice.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

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

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.

An exquisite Baroque church in Vienna's old town.

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.

This museum promotes informed contraception by documenting its often secret past.

The resting place for anonymous victims of the Danube's dark waters.

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

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

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

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

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

The beautiful baroque library of the Hapsburg empire.

A clock designed to run with perfect accuracy for 10,000 years.

An artistic tribute to the famous singer, just around the corner from where he was born.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

A decommissioned tube carriage within a London museum hosts a regular pop-up supper club.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.