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

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

This commanding mausoleum holds the remains of Muhammad Ali Jinnah, the founder of Pakistan.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

Eighty million natural history specimens call this gargantuan museum home.

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

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

Old batteries and frog skeletons reside in this lakeside monument to Alessandro Volta.

Space-age minarets towering over Islamabad.

A 17th-century mosque that was used for war more than worship.

A mere stone's throw from Islamabad exists a spectacular display of three millennia of humanity's progress.

These stairs were built to accommodate royals mounted on elephants.