This Neolithic passage tomb forms part of a World Heritage Site.

The ancient tomb acts as a calendar that keeps perfect time.

The ruins of a sixth-century monastery sit on the banks of the River Shannon.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

A diminutive, thousand-year-old church believed to be the smallest in Ireland.

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

A new sculpture calls attention to climate change in the centuries-old city it threatens.

According to tradition this is the oldest church in Venice, but its actual age is a mystery.

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

Two stone columns flank the grand Venice square, but there were supposed to be three.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

The marble facade hides a little-known medical museum with early surgical instruments and rare copies of canonical texts.

Go inside to really appreciate this 500-year-old technological masterpiece.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Drink wine handed out through a window as part of an age-old tradition.

The middle finger of modernity.

This Massachusetts home was the first to have a telephone line and its own phone number: 1.

Memorial to a beloved puppeteer as well as all street performers.

An enormous, inside-out glass globe built in 1935.

This impressive Boston holy house is the American mecca for Christian scientists.