A beautiful and abandoned New York subway station from 1904, complete with chandelier.

World's only nuclear reactor operated by liberal arts undergraduates.

Long-secret natural history museum, featuring the skull of a "Terror Bird."

Mysterious Spanish catacombs of unknown origins.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

The oldest public library in Ireland.

A museum designed by and dedicated to P.T. Barnum in the town where he is buried.