This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

A mushroom-shaped outcropping that has come to be the symbol for an entire town.

Virgil's many-mouthed gateway to the underworld.

Pompeii's less famous neighbor is still revealing her secrets.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

An idle pastime becomes a record holder in Boys Town, Nebraska.

Tracks near this Texas nature site were once thought to support the Creationist belief that man and dino coexisted.

Modest by day, illuminated majestically at sunset.

Used as an example in one of the first dictionary entries for "museum" in 1706.

One of Europe's oldest libraries.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

Home to the most complete dodo remains known - one head, and one foot.

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

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

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

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

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

Bouncing, delightful, mechanical art at the MIT Museum.

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

The site of Paul Revere's historic two lantern warning.

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

The headquarters of the famous Yale society.

Yale University's home for rare works, including the mysterious Voynich Manuscript.