This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Christ's blood preserved in a Belgian town.

A surreal statue honoring Prague's favorite literary son.

Macabre astrological automaton clock dating to the late 1400s.

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Modern commuters still pass through this 2,000-year-old Roman archway.

A kaleidoscopic warehouse-maze of handmade neon signs.

This magnificent museum claims to house the cranium of a disciple and the skull of a pope.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The patron saint of spinsters grasps a container of dried blood.

A musical instrument played by the sea.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Metro station with a claim to rock n' roll fame.

Cold war icon and onetime "hole" in the iron curtain.

Floating swimming pool within a moored vessel.

A fascinating insight into daily life in the Eastern Bloc.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

The tomb of one of Scotland's bloody historic villains is a magnet for bumbling desecrators.

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

The final resting place of soldiers' loyal canine companions.

Ship-sized kinetic sculptural fantasy.