Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

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

This pub built its reputation pouring post-shift pints for employees of the cemetery with which it shares a wall.

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

This Neolithic passage tomb forms part of a World Heritage Site.

At this cozy bar tucked down a hidden Galway backroad, Guinness makes the Gaelic come out.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

A Beaux-Arts triumph rises from decades of decay to become the heart of a new innovation district.

A modern mechanical planetary system, part of a 10,000 year clock.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

One of the last remnants of the city's Chinese nightclub scene is now a dive bar selling killer mai tais.

Early prototype for Frank Lloyd Wright's Guggenheim.

These WWII-era murals were initially booed as a libelous portrayal of the American dream but have survived multiple attempts to have them destroyed.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The library's graceful rotunda is like a bibliophile's temple.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

The burning of this 12th-century church kicked off a campaign of Norwegian Black Metal terror.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

A Viking-style brewpub named for a Norse sea giant, in the heart of fjord country.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

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

The attic of a four-century-old canal house hides a clandestine church.