The farm where one of America's greatest leaders was raised is now a well-appointed landmark.

The first artificial white water river course in North America cuts right through an Indiana city.

The home used in just a few seconds of film that came to define the setting of a hit sitcom.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

The burial place of some of Mexico's most prominent residents is full of macabre stories and hidden masonic symbols.

The only castle in North America to ever house European sovereigns.

This colossal ancient jaguar sculpture was used as a vessel for the hearts torn from sacrificial victims.

Inside a busy metro station, an impressive mural depicts the prehispanic city of Tenochtitlán.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

A scientific repository of goiters, boils and other ailments throughout Mexican history.

A museum in the former home of Marxist revolutionary Leon Trotsky.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

Architect Le Corbusier built his friend a cubist house to match his impressive collection of cubist art.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

A modern-day Lascaux cave underneath Paris.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

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

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

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

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.