From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The final resting place of the great navigator, or maybe his brother.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

There just so happens to be a court even higher than the U.S Supreme Court: a basketball court in the building itself.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

A unique sculpture park that specializes in the huge and bizarre.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

A layered tribute to the work of mosaicist Isaiah Zagar.

World's first "penitentiary," meant to be humane, drove men insane.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Dr Barnes' $25 billion private collection of art and arboretum.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

Shoot for par over the bodies of the dead on this cemetery-cum-golf course.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.