This unusual structure may be on its way to becoming a cultural landmark in Toronto.

The Incredible Hulk, Yoda, Mulder and Scully, and many many others watch over the mean streets of Toronto.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

This Toronto garden collects stares and tchotchkes in equal measure.

The site where Charles Dickens gave his first public reading of "A Christmas Carol" in the US.

This giant Boston statue of Mary is standing on a globe to show her power over the universe.

"Mock all and sundry things, but leave the saints alone."

Narrowest house in Boston.

The Boston square dedicated to the dark poet who was born nearby.

Two thousand artifacts from around the world collected by one woman who loved to travel.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

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

This park on the outskirts of Rome boasts two ancient Roman aqueducts and a medieval tower.

A huge enchanting public park just outside the ancient walls of Rome.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

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

The Pope’s secret escape route.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

A Nesting Doll of Churches.

Jesus' footprints and the first catacombs in the world.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.