Macabre astrological automaton clock dating to the late 1400s.

Belfast's namesake river still winds below the city center, hidden from sight.

A museum marks and documents the site of the Titanic's launch.

The ancient tomb acts as a calendar that keeps perfect time.

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

This ancient Irish tower could easily have stood in for Rapunzel's prison.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

A corkscrew-shaped barn in Ireland.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

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

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This black shoreline is made up of exploded lava particles.

An icon of the city, this chapel features an amazing dome ceiling and offers panoramic views.

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

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.

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

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

The underground sanctuary of a mysterious ancient cult.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

This hydraulic power system in London was, at one time, seen as a rival to electricity and the last of its kind to shut down.

Formerly known as Saville Theatre, this mid-20th-century entertainment hub includes an ornate frieze.