The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

This crumbling medieval basilica once attracted pilgrims by the thousands to collect a miraculous dust that formed above the saint's tomb.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

Built in 1933, this unique ballroom is nicknamed the "floating dance floor."

Walk up a ramp through a forest for panoramic views of Lake Michigan.

A lovely hidden waterfall right off the highway is well worth a stop.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

This tiny train shuttles passengers to one of Northern Ireland's most spectacular sights.

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.