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

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

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

A patriotic medieval knight in driven-nail armor raised money for widows and orphans of WWI.

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

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

Op-art architecture designed for happiness.

A neo-Gothic mansion now houses a wunderkammer of analog tech that hits on all the senses.

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

The beautiful baroque library of the Hapsburg empire.