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 world's oldest bookshop still in operation.

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

This isolated island is often capped by its own fluffy cloud.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

Some of the earliest leaders of the Moravian congregation are buried here.

This bewitching Babylonian goddess haunts a hallway of the British Museum.

A tongue-in-cheek arcade where the games are based on everyday life.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

Frida Kahlo's childhood home, now a museum of her life and works.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

The earliest known map to show America, discovered by accident at a Paris bookshop.

This natural sea arch highlights Ireland's rugged coastal beauty.

A particularly disconcerting tribute to Irish martyrs.