The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Experience what life was like in Ireland during the Viking and medieval ages.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

The most loyal of little dogs, or a Victorian era publicity stunt?

A secluded art gallery hidden within the cellars beneath Tallinn’s medieval monastery.

The oldest continuously operating pharmacy in Europe.

Only a fragment of this 15th-century Dance of Death survives today.

A treasure trove of scientific instruments from the 17th and 18th centuries.

An opulent monument built for a duke who donated his entire fortune to the city of Geneva.

The world's largest second-hand graces a clock surrounded by constantly changing flower beds. 

One of the longest wooden benches in the world snakes around Geneva's Treille Promenade.

Home of the Large Hadron Collider and the birthplace of the World Wide Web.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

Ancient mysterious ruts carved in the bedrock.

Throughout this shopping mall are medieval ruins that were discovered during the mall's construction.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Macabre astrological automaton clock dating to the late 1400s.

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

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

This snug medieval lane is one of the narrowest streets in the world.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."