A hidden three-foot-wide house separates these two regal churches.

A small but charming botanical garden that contains many exotic plant species.

Ancient catacombs form the foundation for this Rococo orgy of a church.

The stunning interior of this Gothic church is covered in ornate gold details.

Elaborate tile work in this railway station tells the story of Portugal.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

Hundreds of hidden passageways weave through the old quarters of Lyon.

A colorful piece of contemporary art cheerfully clashes with Lyon's historical architecture.

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

One of Ireland's most infamous prisons for rebels including men, women and children.

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

A particularly disconcerting tribute to Irish martyrs.

The modern birthplace of Irish freedom.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.