This 38-drawer structure claims the superlative title, but it isn't the world's only giant filing cabinet.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

A soon-to-be-forgotten roadside spectacle loaded with local lore.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

Penn State's giant bug collection.

Mysterious 500-year-old tapestries depict a unicorn hunt.

A pyramid commemorates the birthplace of James Buchanan, the 15th president of the United States

This 19th century machine put animals (including humans) in boxes to study how they metabolized calories.