The ruins of a medieval monastery named after a type of tree.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

A stunning Victorian abbey and walled garden on a lakefront.

An unusual manor of stunning beauty, born out of a crippling disease.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

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

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

This historic hotel invented the chocolate brownie.

An architectural oddity hides in plain sight on this iconic London bridge.

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

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

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

The bronze uniforms commemorate the vital role of women during World War II.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

This ancient Egyptian obelisk still bears the wounds of World War I.

A unique tribute to the millions of animals who served and died for the British military.

This one has sailed five times as far as Sir Francis Drake's famous ship.

Ship-sized kinetic sculptural fantasy.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

Charles Babbage's proto-computer, painstakingly brought to life.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Two plaques commemorate the site of Shakespeare's first theatre.

A wonderfully eclectic Victorian aquarium lies in the basement of the Horniman Museum.