Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

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

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

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

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

Regency-era excess on the English Coast.

The celebrated eyesore created by starry-eyed sweethearts.

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

France's most famous cemetery, with some of its most curious tombs.

The "Little Ones," show Portugal in full miniature splendor.

As the highest point in the Mid-Atlantic range this stratovolcano offers spectacular views.

An exquisite collection of fairytale conveyances that puts most car museums to shame.

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

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

One of the largest Roman settlements in Portugal.

A majestic hotel for dreamers rises from the center of a fairytale wood.

The corpse bride of Portugal.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

A unique seaside cave where Aleister Crowley faked his own death.