This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

Macabre astrological automaton clock dating to the late 1400s.

This enormous storm barrier is one of the largest moving structures on Earth, with each arm taller than the Washington Monument.

Pull up and have a drink at a museum filled with hundreds of years worth of shipwreck artifacts.

A former plague hospital turned medical museum.

A unique hotel for the artistic soul.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

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

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

One of the best collections of wax anatomical models in the world.

Macabre museum devoted to historical Viennese murders.

This former insane asylum now holds a pathological anatomy museum.

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

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

The beautiful baroque library of the Hapsburg empire.

This unique bridge physically lifts a piece of the road into the air to let boats pass by.

The place where houses are born.

The tallest waterfall in the Netherlands is a lovely, stepped feature that is only 50 feet tall.

This disused VLF radio station is no longer in service but the surrounding town still bears its name.

This miniature take on the Kremlin is one Dutch man's retirement project.

A unique collection of gilded age mechanical pianos.

Tucked away in the Leiden city hall are a group of works by famed artist MC Escher.

Unchanged for centuries, this medieval library keeps its books in chains.

A UFO-shaped event building originally intended to be a science museum showcasing the future.