This is the largest cemetery in Ireland and the first cemetery museum in the world.

After it was swallowed by a Georgian mansion, this medieval castle remained forgotten for centuries.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

The chaotic studio of one of the 20th century's most important artists has been preserved down to the dust.

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.

A reproduction of the famous prehistoric cave paintings is hidden underground at the National Archaeological Museum.

The first modernist church in Europe.

The solemn exterior conceals an opulent interior of this 17th century church.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

Collection dedicated to funeral rites, equipment, and mourning rituals of the Viennese.

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

An exquisite Baroque church in Vienna's old town.

This cubist Vienna church building looks like some sort of alien stonehenge.

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

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

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 beautiful baroque library of the Hapsburg empire.

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

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

A unrivaled and rather horrifying collection of wax dermatological models.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

The history of radiation is on safe display at the foot of a radiation science laboratory.