The ruins of an ancient temple to the Aztec wind god discovered in the middle of a metro station.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

São Paulo's oldest magic shop has been hiding in plain sight for nearly four decades.

The site where one of the most famous poems of World War I was composed is preserved to honor the legacy of the work.

A chapel on a volcanic core, marking the end of a successful journey.

The world's largest reflecting pool is just two centimeters deep.

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.

A rare example of World War I trenches from the British front.

A moving memorial to the fallen and missing from WWI trenches.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

A whimsical cottage from the 1300s with a preserved Victorian-era post office inside.

A monument to the thrice mayor of London who according to lore made his fortune by selling his rat-chasing cat.

A quiet, semi-secret square with statues of Mahatma Gandhi, Virginia Woolf, and a conscientious objectors stone.

The castle still holds traces of the abandoned Roman fort it was built atop.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

This mesmerizing statue of a child wrestling an anteater symbolizes the native culture and biodiversity of São Paulo.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.

A student driver's nightmare.

An unusual round church in London with a Templar past.

Paris' linguistic guide to the international language of, yes, love.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

Northern Ireland's Brobdingnagian stepping stones.

This giant mural of Santa Muerte in downtown São Paulo reminds passersby of their own mortality.