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

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

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

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.

Dine amidst exotic plants at this former royal greenhouse.

This former insane asylum now holds a pathological anatomy museum.

Macabre museum devoted to historical Viennese murders.

The beautiful baroque library of the Hapsburg empire.

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

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

A line number in Amsterdam that will likely never be used again due to its tragic history.

This vast collection of smoking pipes from across the world spans centuries.

Debatably clever, or just plain honest hotel advertised as "The Worst Hotel in the World."

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

The former home of a mad diplomat is said to still be marked in bloody, arcane scrawls.

A rare tour of an aristocrat's private home reveals valuable 17th-century paintings from artists like Rembrandt.

Amsterdam's former hotspot for public executions and dissections.

A poignant museum dedicated to the history of the Dutch resistance against Nazi occupation

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

A unique collection of gilded age mechanical pianos.

This subterranean studio is filled with fascinating kinetic art.

This unusual elevator doesn’t stop or slow down.