One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

This one-time health resort was used by aristocrats around the world.

This breathtaking monastery was established by Saint Benedict himself 1,500 years ago.

Climb the dead electric pylons of Messina.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

Its interior is adorned with some of the best examples of early Christian mosaics.

St. Francesca Romana, patron saint of drivers, resides in the church she founded.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

A small cell adjacent to this church was once the bedroom for a renowned saint.

The famous winding walk at Chartres is surrounded in mystery and myth.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

The atmospheric road was never meant to be so creepy.

Northern Ireland's Brobdingnagian stepping stones.

This massive monument has been telling the time for 150 years—at a slight angle.

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

A boulder in the Churchyard of Down Cathedral marks the legendary burial place of "The Apostle of Ireland."

The severed head of a 17th-century Irish martyr lies within an intricate golden shrine.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

Be(w)ar(e) the moat around this historic Czech castle.

Why a column on the entrance is inscribed with a verse from the Quran is one of Sicily's many mysteries.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.